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Corrosion test piece carbon steel

Corrosion test piece carbon steel, Total:131 items.

In the international standard classification, Corrosion test piece carbon steel involves: Iron and steel products, Environmental testing, Test conditions and procedures in general, Corrosion of metals, Semiconducting materials, Testing of metals, Lubricants, industrial oils and related products, Petroleum products in general, Fuels, Paints and varnishes, Materials for aerospace construction, Petroleum, petroleum products and natural gas handling equipment, Construction materials, Aerospace electric equipment and systems, Protection of and in buildings, Surface treatment and coating, Organic chemicals, Road vehicle systems, Ferrous metals, Equipment for the chemical industry, Equipment for petroleum and natural gas industries, Fluid storage devices, Protection against fire, Reinforced plastics.

Cooling Technology Institute, Corrosion test piece carbon steel

CTI STD-149-2000 Corrosion Testing Procedures Corrosion Coupon Testing and Test Devices

Professional Standard - Petroleum, Corrosion test piece carbon steel

SY/T 0029-1998 Standard of test method for corrosion tate of buried steel test pieces

Group Standards of the People's Republic of China, Corrosion test piece carbon steel

T/CSTM 00045.2-2018 Soil environment corrosion test— Part 2: Corrosion tests of carbon steels, low alloy steels and protective coatings
T/CSCP 0030-2017 Carbon steel and low alloy steel and coating soil corrosion test
T/CASAS 013-2021 Measuring method for testing the density of dislocation in SiC crystal Combined KOH etching and image recognition methods

PL-PKN, Corrosion test piece carbon steel

PN H04630-1966 Corrosion tes?ing of me?als Laboratory ?es?ing of intercrystalline corrosion resis?ance of corrosion resis?ing steel
PN C04547 ArkusZ03-1974 Water and waste water Tests for carbon diox?de Determination of aggressivecarbon dioxide in water
PN B01810-1986 Protection against corrosion in building Protective properties of concrete refering to reinforcing steel Electrochemical tests

Taiwan Provincial Standard of the People's Republic of China, Corrosion test piece carbon steel

CNS 13753-2005 Corrosion of metals and alloys - Corrosivity of atmospheres - Determination of corrosion rate of standard specimens for the evaluation of corrosivity

American Society for Testing and Materials (ASTM), Corrosion test piece carbon steel

ASTM A1067-10 Standard Specification for Test Coupons for Steel Castings
ASTM D1838-16 Standard Test Method for Copper Strip Corrosion by Liquefied Petroleum (LP) Gases
ASTM G48-03 Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM G48-03(2009) Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM G48-00 Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM G48-99A Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM G48-11(2015) Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM D7893-13(2018) Standard Guide for Corrosion Test Panel Preparation, Testing, and Rating of Coil-Coated Building Products
ASTM G48-11 : Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM G48-11(2020)e1 Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
ASTM E937/E937M-93(2015)e1 Standard Test Method for Corrosion of Steel by Sprayed Fire-Resistive Material (SFRM) Applied to Structural Members

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, Corrosion test piece carbon steel

GB/T 30868-2014 Test method for measuring micropipe density of monocrystalline silicon carbide wafers.Chemically etching
GB/T 26066-2010 Practice for shallow etch pit detection on silicon
GB/T 41951-2022 Corrosion of metals and alloys—Test method for the corrosion resistance of construction steel joint and member
GB/T 37619-2019(英文版) Corrosion of metals and alloys—Potentiostatic test and evaluation method for determination of susceptibility to grooving corrosion of high frequency electric resistance welded steel pipes
GB/T 25151.3-2010 Fabrication and inspection method for high pressure urea equipment.Part 3:Intergranular corrosion tendency test for ultra low-carbon chromated nickel molybdenum austenitic stainless steel of urea grade
GB/T 25151.4-2010 Fabrication and inspection method for high pressure urea equipment.Part 4:Intergranular corrosion tendency test specimen preparation for ultra low-carbon chromated nickel molybdenum austenitic stainless steel of urea grade

CU-NC, Corrosion test piece carbon steel

NC 12-04-51-1988 Standards System for Protection Against Corrosion. Corrosion of Concrete Reinforcing Steel Electrochemical Testing Method

Indonesia Standards, Corrosion test piece carbon steel

SNI 07-1335-1989 Corrosion resistance steel and alloy to well and gap corrosion using ferri chloride solution, Resistance test method.
SNI 13-6214-2000 Preparation and installation of corrosion coupons and interpretation of test data in oilfield operations

Korean Agency for Technology and Standards (KATS), Corrosion test piece carbon steel

KS D 0236-2003(2018) Stress corrosion cracking test for stainless steels
KS D 0236-1986 Stress corrosion cracking test for stainless steels
KS F 2600-2008(2018) Standard test method for corrosion evaluation of reinforcing bar by image analysis method
KS D ISO 3651-1:2004 Determination of resistance to intergranular corrosion of stainless steels - Part 1 Austenitic and ferritic austenitic(duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass(Huey test)
KS D ISO 3651-1:2019 Determination of resistance to intergranular corrosion of stainless steels — Part 1: Austenitic and ferritic-austenitic(duplex) stainless steels — Corrosion test in nitric acid medium by measurement o
KS D ISO 3651-2:2019 Determination of resistance to intergranular corrosion of stainless steels — Part 2: Ferritic, austenitic and ferritic-austenitic(duplex) stainless steels — Corrosion test in media containing sulfuric
KS R ISO 6315-2014(2019) Road vehicles — Brake linings — Seizure to ferrous mating surface due to corrosion — Test procedure
KS D ISO 3651-2:2004 Determination of resistance to intergranular corrosion of stainless steels-Part 2:Ferritic, austenitic and ferritic-austenitic(duplex) stainless steels-Corrosion test in media containing sulfuric acid
KS D ISO 3651-2:2014 Determination of resistance to intergranular corrosion of stainless steels — Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing sulfuric acid
KS D 0278-2020 Standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution

RU-GOST R, Corrosion test piece carbon steel

GOST 9.911-1989 Unified system of corrosion and ageing protection. Atmospheric steel. Accelerated corrosion test method
GOST 33254-2015 Insulating oils. Detection of corrosive sulfur. Silver strip test
GOST R 55494-2013 Insulating oils. Detection of corrosive sulfur. Silver strip test
GOST 9.903-1981 Unified system of corrosion and ageing protection. High-strength steels and alloys. Accelerated test methods for corrosion cracking
GOST R 52804-2007 Protection against corrosion of concrete and reinforced concrete constructions.Test methods
GOST R ISO 6315-1993 Road vehicles. Brake linings. Seizure to ferrous mating surface due to corrosions. Test procedure

AENOR, Corrosion test piece carbon steel

UNE 112011:2011 Corrosion of concrete reinforcement steel. Determination of the carbonatation depht for in-service concrete.
UNE-EN 3026:1996 AEROSPACE SERIES. TEST METHOD FOR DRY FILM LUBRICANTS. CORROSION TEST ON STEELS SPECIMENS.
UNE-EN ISO 3651-1:1999 DETERMINATION OF RESISTNACE TO INTERGRANULAR CORROSION STAINLESS STEELS. PART 1: AUSTENITIC AND FERRITIC-AUSTENITIC (DUPLEX) STAINLESS STEELS. CORROSION TEST IN NITRIC ACID MEDIUM BY MEASUREMENT OF LOSS IN MASS (HUEY TEST) (ISO 3651-1:1998)
UNE-EN ISO 3651-2:1999 DETERMINATION OF RESISTANCE TO INTERGRANULAR CORROSION OF STAINLESS STEELS. PART 2: FERRITIC, AUSTENITIC AND FERRITIC-AUSTENITIC (DUPLEX) STAINLESS STEELS. CORROSION TEST IN MEDIA CONTAINING SULFURIC ACID (ISO 3651-2:1998)

International Organization for Standardization (ISO), Corrosion test piece carbon steel

ISO 3651-3:2017 Determination of resistance to intergranular corrosion of stainless steels - Part 3: Corrosion test for low-Cr ferritic stainless steels
ISO 3651-1:1976 Austenitic stainless steels; Determination of resistance to intergranular corrosion; Part I : Corrosion test in nitric acid medium by measurement of loss in mass (Huey test)
ISO 22848:2021 Corrosion of metals and alloys - Test method for measuring the stress corrosion crack growth rate of steels and alloys under static-load conditions in high-temperature water
ISO 3651-2:1976 Austenitic stainless steels; Determination of resistance to intergranular corrosion; Part II : Corrosion test in a sulphuric acid/copper sulphate medium in the presence of copper turnings (Monypenny Strauss test)

British Standards Institution (BSI), Corrosion test piece carbon steel

BS ISO 3651-3:2017 Determination of resistance to intergranular corrosion of stainless steels. Corrosion test for low-Cr ferritic stainless steels
BS EN ISO 3651-1:1998 Determination of resistance to intergranular corrosion of stainless steels - Austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass (Huey test)
BS 2000-112:2005 Methods of test for petroleum and its products - Part 112: Determination of corrosiveness to copper of lubricating grease - Copper strip method (Identical with IP 112:2005)
BS 2000-112:2006 Methods of test for petroleum and its products. Determination of corrosiveness to copper of lubricating grease. Copper strip method
BS EN ISO 3651-2:1998 Determination of resistance to intergranular corrosion of stainless steels - Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid
DD ENV 13797-2001 Corrosion protection. Carbon and low alloy steels for use in hydrogen sulfide containing environments in oil and gas production. Materials and test methods. Guidelines
BS ISO 22848:2021 Corrosion of metals and alloys. Test method for measuring the stress corrosion crack growth rate of steels and alloys under static-load conditions in high-temperature water
BS ISO 21746:2019 Composites and metal assemblies. Galvanic corrosion tests of carbon fibre reinforced plastics (CFRPs) related bonded or fastened structures in artificial atmospheres. Salt spray tests

Danish Standards Foundation, Corrosion test piece carbon steel

DS/ISO 3651/1:1977 Austenitic stainless steels. Determination of resistance to intergranular corrosion. Part I : Corrosion test in nitric acid medium by measurement of loss in mass (Huey test)
DS/EN ISO 3651-1:1999 Determination of resistance to intergranular corrosion of stainless steels - Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass (Huey test)
DS/EN ISO 3651-2:1999 Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid
DS/ISO 22848:2021 Corrosion of metals and alloys – Test method for measuring the stress corrosion crack growth rate of steels and alloys under static-load conditions in high-temperature water

National Association of Corrosion Engineers (NACE), Corrosion test piece carbon steel

NACE TM0111-2011 Slow Strain Rate Test Method for Evaluation of Ethanol Stress Corrosion Cracking in Carbon Steels

Lithuanian Standards Office , Corrosion test piece carbon steel

LST EN ISO 2160:1999 Petroleum products - Corrosiveness to copper - Copper strip test (ISO 2160:1998)
LST EN ISO 6251:2000 Liquefied petroleum gases - Corrosiveness to copper - Copper strip test (ISO 6251:1996)
LST EN ISO 3651-1:2001 Determination of resistance to intergranular corrosion of stainless steels - Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass (Huey test) (ISO 3651-1:1998)
LST EN ISO 3651-2:2001 Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid (ISO 3651-2:1998)

German Institute for Standardization, Corrosion test piece carbon steel

DIN ISO 3651-3:2018 Determination of resistance to intergranular corrosion of stainless steels - Part 3: Corrosion test for low-Cr ferritic stainless steels (ISO 3651-3:2017)
DIN EN 3026:1994-04 Aerospace series; test method for dry film lubricants; corrosion test on steels specimens; German version EN 3026:1994
DIN EN ISO 3651-1:1998 Determination of resistance to intergranular corrosion of stainless steels - Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass (Huey test) (ISO 3651-1:1998); German v
DIN ISO 6315:1981-08 Road vehicles; brake linings; seizure to ferrous mating surface due to corrosion; test procedure
DIN 29995:1980-10 Aerospace; segregation testing on etched slices of remelted steels, nickel and cobalt alloys
DIN EN ISO 3651-2:1998 Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid (ISO 3651-2:1998); German version EN ISO 3651-2:
DIN EN ISO 3651-2:1998-08 Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid (ISO 3651-2:1998); German version EN ISO 3651...
DIN 51360-2:1981-07 Testing of cooling lubricants; determination of corrosion preventing characteristics of cooling lubricants mixed with water; chip/filter paper method
DIN 50915:1993-09 Testing the resistance of unalloyed and low alloy steels to intergranular stress corrosion cracking by attack of nitrate medium; welded and unwelded materials
DIN EN ISO 3651-1:1998-08 Determination of resistance to intergranular corrosion of stainless steels - Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass (Huey test) (ISO 3651-1:1998); Germa...
DIN EN ISO 4623-1:2002 Paints and varnishes - Determination of resistance to filiform corrosion - Part 1: Steel substrate (ISO 4623-1:2000); German version EN ISO 4623-1:2002

RO-ASRO, Corrosion test piece carbon steel

SR ISO 4623:1993 Paints and varnishes. Filiform corrosion test on steel

Society of Automotive Engineers (SAE), Corrosion test piece carbon steel

SAE AMS-STD-753A-2012 Corrosion-Resistant Steel Parts: Sampling, Inspection and Testing for Surface Passivation
SAE AMS-STD-753B-2017 Corrosion-Resistant Steel Parts: Sampling, Inspection and Testing for Surface Passivation
SAE AMS-STD-753A-2006 Corrosion-Resistant Steel Parts: Sampling, Inspection and Testing for Surface Passivation
SAE AMS2374E-2011 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steel and Alloy Forgings
SAE AMS2374D-2002 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steel and Alloy Forgings
SAE AMS2374D-2007 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steel and Alloy Forgings
SAE AMS2374C-1995 QUALITY ASSURANCE SAMPLING AND TESTING Corrosion and Heat Resistant Steel and Alloy Forgings
SAE AMS2374E-2016 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steel and Alloy Forgings
SAE AMS2374F-2023 Quality Assurance Sampling and Testing Corrosion- and Heat-Resistant Steel and Alloy Forgings
SAE AMS5564-1985 STEEL TUBING, CORROSION RESISTANT 19Cr - 10Ni (SAE 30304) High Pressure Hydraulic, Welded Plus Ultrasonically Tested or Seamless
SAE AMS5564A-1986 STEEL TUBING, CORROSION RESISTANT 19Cr - 10Ni (SAE 30304) High-Pressure Hydraulic, Welded Plus Ultrasonically Tested or Seamless
SAE AMS2371J-2011 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steels and Alloys Wrought Products and Forging Stock
SAE AMS2371J-2015 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steels and Alloys Wrought Products and Forging Stock
SAE AMS2371D-1995 QUALITY ASSURANCE SAMPLING AND TESTING Corrosion and Heat Resistant Steels and Alloys Wrought Products and Forging Stock
SAE AMS2371K-2016 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steels and Alloys Wrought Products and Forging Stock

TR-TSE, Corrosion test piece carbon steel

TS 3156-1978 AUSTENIT?C STAINLESS STEELS — DETERMINATION OF RESISTANCE TO INTERGRANULAR CORROSION — CORROSION TEST IN NITRIC ACID MEDIUM BY MEASUREMENT OF LOSS IN MASS (HUEY TEST)
TS 3157-1978 AUSTENITIC STAINLESS STEELS DETERMINATION OF RESISTANCE TO INTERGRANULAR (CORROSION Corrosion Test in a Sulphuric Acid/Copper Sulphate Medium in the Presence of Copper Turnings (Monypenny - Strauss Test)
TS 2741-1977 DETECTION OF COPPER CORROSION FROM PETROLEUM PRODUCTS BY THE COPPER STRIP TARNISH TEST

Association Francaise de Normalisation, Corrosion test piece carbon steel

NF T30-013-1:2002 Paints and varnishes - Determination of resistance to filiform corrosion - Part 1 : steel substrates.
NF T67-115:1969 Aromatic hydrocarbons. Determination of corrosive sulphur in toluenes, xylenes and solvent naphthas. Copper strip test.
NF ISO 6315:1988 Véhicules routiers - Garnitures de freins - Adhérence de la surface ferreuse due à la corrosion - Méthode d'essai.

Professional Standard - Ferrous Metallurgy, Corrosion test piece carbon steel

YB/T 4369-2014 Test method for the corrosion of steel bar embedded in concrete in chloride enviroment

API - American Petroleum Institute, Corrosion test piece carbon steel

API TR 939-D-2007 Stress Corrosion Cracking of Carbon Steel in Fuel-Grade Ethanol: Review@ Experience Survey@ Field Monitoring@ and Laboratory Testing (Second Edition)

European Committee for Standardization (CEN), Corrosion test piece carbon steel

DD ENV 13797-2000 Corrosion Protection - Carbon and Low Alloy Steels for Use in Hydrogen Sulfide Containing Environments in Oil and Gas Production - Materials and Test Methods - Guidelines
EN ISO 3651-1:1998 Determination of Resistance to Intergranular Corrosion of Stainless Steels - Part 1: Austenitic and Ferritic-Austenitic (Duplex) Stainless Steels - Corrosion Test in Nitric Acid Medium by Measurement of Loss in Mass (Huey Test) ISO 3651-1:1998
EN ISO 3651-2:1998 Determination of Resistance to Intergranular Corrosion of Stainless Steels - Part 2: Ferritic, Austenitic and Ferritic-Austenitic (Duplex) Stainless Steels - Corrosion Test in Media Containing Sulfuric Acid ISO 3651-2:1998

YU-JUS, Corrosion test piece carbon steel

JUS U.M1.044-1982 Concrete. Admixtures. Testing of the influence ofadmixture on corrosion of steel in concrete

European Association of Aerospace Industries, Corrosion test piece carbon steel

AECMA PREN 2003-11-1986 Aerospace Series Test Methods for Austenitic Stainless Steels Part 11 - Determination of Resistance to Intergranular Corrosion by the Huey Method Issue P 1
AECMA PREN 2003-12-1986 Aerospace Series Test Methods for Austenitic Stainless Steels Part 12 - Determination of Resistance to Intergranular Corrosion by the Monypenny-Strauss Method Issue P 1

SE-SIS, Corrosion test piece carbon steel

SIS SS 06 13 01-1990 Consumables — Wire electrodes and fluxes for submerged-arc welding of carbon steels, carbon-manganese steels, microalloyed steel and low-alloyed steels — Weld metal test specimens for all-weld-metal tests
SIS SS 3106-1978 Gland packings for valve stems — Testing the corrosive effect on stainless steel stems with 12-14% Cr
SIS SS 06 11 01-1990 Welding electrodes — Wire electrodes and tubular wires for gas metal arc welding and metal arc welding of carbon steel, carbon-manganese alloyed steel, microalloyed steel and low-alloyed steel — Weld metal test specimens for all-weld-metal tests

SAE - SAE International, Corrosion test piece carbon steel

SAE AMS2374C-1991 Quality Assurance Sampling and Testing Corrosion and Heat Resistant Steel and Alloy Forgings
SAE AMS2371F-1997 Quality Assurance Sampling and Testing Corrosion and Heat Resistant Steels and Alloys Wrought Products and Forging Stock
SAE AMS2371E-1996 Quality Assurance Sampling and Testing Corrosion and Heat Resistant Steels and Alloys Wrought Products and Forging Stock
SAE AMS5564B-1992 Steel@ Corrosion Resistant@ Tubing 19Cr - 10Ni (SAE 30304) High- Pressure Hydraulic@ Welded Plus Ultrasonically Tested or Seamless (UNS S30400)

IN-BIS, Corrosion test piece carbon steel

KR-KS, Corrosion test piece carbon steel

KS D ISO 3651-1-2019 Determination of resistance to intergranular corrosion of stainless steels — Part 1: Austenitic and ferritic-austenitic(duplex) stainless steels — Corrosion test in nitric acid medium by measurement o
KS D ISO 3651-2-2019 Determination of resistance to intergranular corrosion of stainless steels — Part 2: Ferritic, austenitic and ferritic-austenitic(duplex) stainless steels — Corrosion test in media containing sulfuric

Canadian General Standards Board （CGSB), Corrosion test piece carbon steel

CGSB 1-GP-71 METH 113.6-1979 Methods of Testing Paints and Pigments Corrosion Humidity Cabinet Test, One Coat of Material Applied to Steel Panels
CGSB 1-GP-71 METH 113.8-1979 Methods of Testing Paints and Pigments Corrosion Humidity Cabinet Test, Two Coats of Material Applied to Steel Panels

AASHTO - American Association of State Highway and Transportation Officials, Corrosion test piece carbon steel

TP11-1995 Standard Test Method for Rapid Determination of Corrosion Rate of Uncoated Steel in Reinforced Concrete (Edition 1C)
T 374M/T 374-2017 Standard Method of Test for Comparative Qualitative Corrosion Characterization of Uncoated Chromium-Alloyed Steel Bars Used for Concrete Reinforcement (Tombstone Test)

CZ-CSN, Corrosion test piece carbon steel

CSN 03 8376 Za-1981

未注明发布机构, Corrosion test piece carbon steel

SAE AMS2371L-2019 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steels and Alloys Wrought Products and Forging Stock

The American Road & Transportation Builders Association, Corrosion test piece carbon steel

AASHTO TP11-1995 Standard Test Method for Rapid Determination of Corrosion Rate of Uncoated Steel in Reinforced Concrete 2000 Edition

Professional Standard - Chemical Industry, Corrosion test piece carbon steel

HG/T 3173-2002 Fabrication and inspection method for High pressure urea equipment intergranular corrosion trend test on the urea grade extra low carbon Cr-Ni-Mo austenitic stainless steel
HG/T 3172-2002 Fabrication and inspection method for High pressure urea equipment preparation of the test coupons for the intergranular corrosion trend test on the urea grade extra low carbon Cr-Ni-Mo austenitic stainless steel