SY/T 0599-1997 Requirements for metal materials resistant to sulfide stress cracking for natural gas surface facilities
Some standard content:
ICS 75.180.01;77.040.99
Registration No.: 1142—1998
Petroleum and Natural Gas Industry Standard of the People's Republic of ChinaSY/T 05991997
Sulfide stress cracking resistant metallic materiarequirements for gas surface equipment1997-12-31Published
China National Petroleum Corporation
Implemented on 1998-07-01
SY/T 0599-1997
Cited Standards
Requirements for Materials Used in Some Natural Gas Surface Facilities
Appendix A (Appendix to the Standard) Metal Materials Used in Acidic Environments
SX/T0599-1997
The first edition of this standard, SYJ12-85, was formulated on the basis of summarizing the scientific research and production practice experience of preventing sulfide stress cracking of wet natural gas containing hydrogen for many years, and referring to the National Association of Corrosion Engineers (NACE) standard MR0175 "Metallic Materials Resistant to Sulfide Stress Cracking for Oilfield Equipment". In the past ten years since its release, it has basically met the requirements of my country's petroleum industry. The 4th revision was made in accordance with the provisions of GBT1.11993 "Guidelines for Standardization Work Unit 1: Drafting and Expression Rules of Standards Part 1: Basic Provisions for Standardization Writing". The content and writing format of SYJ12-85 were defined. The content mainly adds two chapters "reference standards and definitions" and Table A3 in Appendix A\Pipes for sour environments". The metal materials for sour environments provided in this standard have been adjusted and modified according to the revision of relevant standards. This standard will take effect from the last month: At the same time, it replaces SYJ12-85. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the Planning and Design Institute of China National Petroleum Corporation. The drafting unit of this standard: Sichuan Design Institute of China National Petroleum Corporation. The drafter of this standard is Lin Xuemei
This standard entrusts Sichuan Design Institute of China National Petroleum Corporation to be responsible for interpretation and release of this standard: November 28, 1985. 1. Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T0599—1997
Generation #SYJ1285
Sulfide stress cracking resistant metallic material requirements for gas surface equipment This standard specifies the requirements for sulfide stress cracking resistance of metallic materials used in surface facilities of oil and gas fields containing hydrogen sulfide. This standard is applicable to surface facilities in contact with hydrogen sulfide-containing media, such as well sites, gas gathering stations, process equipment and gas collection pipelines in purification plants, etc.:
2 Referenced standards
The provisions contained in the following standards constitute the provisions of the standards by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised: All parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T230—1991Metal Rockwell hardness test methodGB/T231--1984Metal Brinell hardness test methodGB/T1172—1974Black gold corrosion resistance and strength conversion valueGB3087--1982Seamless steel pipe for low and medium pressure boilersGB/T4340--1984Metal Vickers hardness test methodGB5310—1995Seamless steel pipe for high pressure boilersGB6479—1986High pressure seamless steel pipe for fertilizer equipmentGB/T8163--1987Seamless steel pipe for conveying fluidGB/T12229—1989Technical parts of general valvesCarbon slurry steel castings3Definitions
This standard adopts the following definitions.
3.1Sulfide stress crackingSulfide stress crackingThe brittle cracking phenomenon produced by the combined action of tensile stress and corrosion of water and H,S medium on metal materials is called chemical stress cracking.
Sulfide stress cracking is related to the hydrogen atoms generated on the metal surface during the sulfide corrosion process, which penetrate into the metal and cause metal hydrogen embrittlement. Sulfide stress cracking is prone to occur in high-strength steel or high-hardness areas of welds. 3.2 Blister oracking
Due to the extremely high hydrogen internal pressure in the metal, a group of planar holes is formed under the surface of the metal, which is called hydrogen blistering. This planar hydrogen blistering is often also called blister cracking. For low-strength metals, as the blister grows closer to its surface, blistering appears on the metal surface. Hydrogen blistering in the metal is related to the adsorption and diffusion of hydrogen ions generated on the metal surface during the sulfide corrosion process. The formation of hydrogen blistering in the metal is the result of hydrogen atoms gathered in certain parts of the metal combining to form hydrogen ions. Typical locations where hydrogen blistering occurs are coarse non-metallic debris, layers or other discontinuous structures in metals. This standard defines hydrogen blistering as white spots, blistering and cracking associated with high temperature hydrogen corrosion:
3.3 Stepwise cracking Approved by China National Petroleum Corporation on December 31, 1997 and implemented on July 1, 1998
SY/T 0599-1997
In metals, hydrogen blistering (bubble cracks) on adjacent planes under the surface of the metal are combined to form a step-shaped internal crack called hydrogen induced cracking. This step-shaped hydrogen induced crack is often called step-shaped cracking due to its appearance characteristics.
The formation of hydrogen induced cracks does not require any external stress. These internal cracks (blister cracks) will expand in the direction of connecting with other cracks according to the transgranular plastic shear mechanism caused by the internal pressure of hydrogen. Hydrogen-induced cracks tend to appear in the area where coarse planar inclusions gather in steel or in the area of abnormal microstructure generated by the segregation of alloying elements. 3.4 Hydrogen damage
During the sulfide corrosion process, the hydrogen atoms generated on the metal surface enter the metal, causing the plasticity and toughness of the metal material to decrease, making it easy to cause brittle cracking. This damage phenomenon is called hydrogen damage. 4 General
4.1 In order to prevent hydrogen sulfide-containing oil and gas from causing sulfide stress cracking damage to oil and gas field surface facilities and ensure the safe operation of oil and gas field surface facilities, this standard puts forward requirements for metal materials resistant to sulfide stress cracking. 4.2 This standard is for metal materials used in oil and gas field surface facilities that are induced by hydrogen sulfide. This standard does not include other types of corrosion and damage caused by hydrogen sulfide. However, severe corrosive environments may lead to damage caused by non-sulfide stress cracking mechanisms. For example, some low-strength steels used for pipelines and containers fail due to "bubble cracking" or "step cracking" caused by hydrogen damage associated with general hydrogen sulfide corrosion. Therefore, in the design and operation of equipment, appropriate materials should be selected according to specific circumstances or other measures such as corrosion inhibitors should be used to control it. 4.3 All metal materials exposed to the acid environment specified in 4.4 must meet the requirements of this standard, otherwise sulfide stress cracking damage may occur.
Sulfide stress cracking mainly manifests as: 1) the equipment cannot be restored to normal operation when it continues to bear pressure; 2) damage the integrity of the pressure system; 3) the equipment loses its basic functions. 4.4 Systems that meet the following conditions are acidic environments a) Acidic natural gas systems:
Natural gas containing water and hydrogen sulfide, when the total gas pressure is greater than or equal to 0.4MPa (absolute) and the hydrogen sulfide partial pressure in the gas is greater than or equal to 0.0003MPa (absolute), is called acidic natural gas. Acidic natural gas can cause sulfide stress cracking of sensitive materials. The hydrogen sulfide gas partial pressure in natural gas is equal to the product of the volume percentage of hydrogen sulfide gas in natural gas and the total pressure of natural gas. Whether it is acidic natural gas can be classified according to Figure 1.
6) Sour natural gas-oil system:
For natural gas-oil systems containing water and hydrogen sulfide, when the ratio of natural gas to oil is greater than 1000m/t, whether sulfide stress cracking can be caused shall be classified according to the conditions specified in paragraph a) of this article; when the ratio of natural gas to oil is equal to or less than 1000m/t, whether sulfide stress cracking can be caused shall be classified according to Figure 2, that is, when the total system pressure is greater than 1.8MPa (absolute), the partial pressure of hydrogen sulfide in natural gas is greater than 0.0003MPa (absolute); or the partial pressure of hydrogen sulfide in natural gas is greater than 0.007MPa (absolute); or the total volume of hydrogen sulfide in natural gas is greater than 15%, sulfide stress cracking of sensitive materials may be caused.
4.5 Sulfide stress cracking of surface facilities containing hydrogen sulfide oil and gas can be controlled by one or more of the following measures according to the specific situation.
a) Use the metal materials and processes recommended by this standard h) Control the corrosive environment;
c) Isolate the metal parts from the corrosive environment. 4.6 The metal materials provided in this standard are accepted based on their resistance to sulfide stress cracking in actual field applications, or in sulfide stress cracking tests, or in both situations. 4.7 This standard provides materials and processes for acidic environments. Therefore, it cannot be understood that products that meet the requirements of this standard material can resist sulfide stress cracking caused by acidic environments under all conditions. Improper design, manufacturing, installation or handling can cause the material to change from being resistant to sulfide stress cracking to being sensitive to sulfide stress cracking. H2S.g
0-6895
0:36895
Fluidized material stress cracking zone
Total pressure 0.4MPa (absolute)
Volume percentage of H,S in natural gas
Natural gas reservoir and is under 0.101325MPa condition. Figure 2 Sour natural gas system
System Fluidized material stress cracking zone
LTotal pressure 1.8MPa (absolute)
G7MPa (absolute)-
15%H,S#
Volume percentage of HS in natural gas
Natural gas volume is 0, 0.101325MPa condition. Figure 2 Sour natural gas oil system
4.8 Ratio requirements to supplement the materials included in this standard Materials shall be submitted to the standard compilation unit for the full set of technical documents such as test and on-site assessment reports, technical appraisal certificates, etc. After the compilation unit makes comments, the materials can be included in the list after being submitted to the standard approval unit for approval. 4. When using sulfide stress cracking metal materials provided by advanced foreign standards: the materials must also meet the requirements of the corresponding standards during use.
4.10 This standard uses hardness as the main indicator for testing material and manufacturing quality. Hardness determination should be in accordance with GB/T231, 3
SY/ T 0599 -1997
GB/T230, GB/T4340 and other standards: Hardness conversion should be carried out in accordance with the provisions of GB/T1172 standard. Hardness measurement should meet the following requirements:
a) There should be a sufficient number of measuring points including different positions; b) The average hardness value measured shall not exceed the specified value c) The individual hardness reading shall not exceed two HRCs of the specified value 4.11 In addition to complying with this standard, metal materials for natural gas ground facilities that resist sulfide stress cracking shall also comply with the provisions of the relevant national standards and specifications in force.
5 Materials
5.1 Iron-based metals
5.1.1 The sulfide stress cracking resistance of most iron-based metals is controlled by heat treatment, hardness and cold working. This chapter will provide the heat treatment, hardness and cold working regulations for iron-based alloys to obtain satisfactory resistance to sulfide stress cracking. The iron-based metals listed in Tables A1 to A3 in Appendix A (Standard Appendix) of 5.1.2 can be used in acidic environments, but they should comply with the regulations of 5.1.3, 5.1.4 and 5.1.5 respectively. Manufacturing shall comply with the provisions of Chapter 6 5.1.3 Carbon steel and low alloy steel used in sour environment shall meet the following requirements: a) Nickel content must be less than 1%; b) The hardness of carbon steel and low alloy steel after hot rolling (only for low carbon steel), annealing, normalizing and tempering must be less than or equal to HRC22 e) The hardness of carbon cast steel and low alloy cast steel after annealing, normalizing and tempering must be less than or equal to HRC22 d) When carbon steel and low alloy steel are subjected to any cold deformation by cold rolling, cold forging or other manufacturing processes, resulting in a permanent deformation of the surface fiber greater than 5%, stress relief heat treatment shall be performed regardless of the hardness, and the heat treatment temperature shall not be lower than 60%℃. The hardness after heat treatment must be less than or equal to HKC22, GB3087, GB6479, GB/T8163, GB5310 20# steel pipe or low-strength steel pipe fittings with similar chemical composition. When the cold deformation is less than or equal to 15%, and the hardness of the deformation zone does not exceed HB190, no heat treatment is required.
5.1.4 Austenitic stainless steel used in acidic environment shall meet the following requirements: a) Austenitic stainless steel in the state of solid solution and solid solution stabilization must have a hardness less than or equal to HRC22: b Austenitic stainless steel with mechanical properties strengthened by cold working cannot be used; after permanent cold deformation of austenitic stainless steel parts, stress relief heat treatment shall be performed, and the hardness after heat treatment must be less than or equal to HRC223c) 3Cr17Ni7Ma2N (318) bars, after solid solution treatment [1130℃=10℃, 2h, water rate), the hardness must be less than or equal to HRC24.
5.1.5 Martensitic stainless steel for acidic environment 1) 2 shall meet the following requirements a) Martensitic stainless steel, after annealing-tempering or annealing-tempering treatment, the hardness must be less than or equal to HRC22, each tempering temperature should not be less than 620°C, and the second tempering temperature should be lower than the first tempering temperature: b) After cold deformation, martensitic stainless steel should be subjected to stress relief heat treatment at a temperature not less than 620°C. The hardness after heat treatment must be less than or equal to HRC22..
5.2 Non-ferrous metals
5.2.1 The non-ferrous metals listed in Table A4 in Appendix A (Standard Appendix) can be used in acidic environment. However, they shall comply with the provisions of 5.2.25.2.3, 5.2.4 and 5.2.5 respectively. It is worth noting that when these materials are subjected to stress in acidic environment, stress corrosion cracking may occur regardless of whether corrosion inhibitors are used, and the sensitivity to sulfide stress cracking increases under plastic deformation. Some of these materials may be damaged by hydrogen embrittlement when subjected to strong cold working and transverse stress. 1 Austenitic stainless steel and martensitic stainless steel are prone to chloride corrosion cracking under certain conditions. 2 Martensitic stainless steel is not suitable for use as rods or other high-stress parts in acidic environments. 4
SY/ T 0599-1997
5.2.2 Austenitic nickel-based alloys should be subjected to solid solution-aging treatment, hot rolling-aging treatment or intermediate solution-cold deformation: aging treatment. 5.2.3 Austenitic cobalt-based alloys should be subjected to solid solution-aging treatment. 5.2.4 Titanium alloy forgings should be subjected to dehydrogenation annealing or solid solution-aging treatment. 5.2.5 When copper and steel alloys are used in acidic environments, weight loss corrosion may be accelerated, especially in the presence of oxygen. 5.2.6 The spray welding alloys and cladding incandescent rods listed in Table A5 of Appendix A (application of standard) can be used in acidic environments. 6 Manufacturing
6.1 The welding of metal materials in acidic environment shall meet the following requirements: a) In addition to complying with the relevant provisions of the current national standards, the welding procedures shall also comply with the requirements for base metal materials in Chapter 5;
In addition to the necessary stress relief heat treatment to control the welding thermal stress, the hardness of the weld chain shall be controlled, including the entire cross section, heat affected zone and base metal. Ensure that the hardness of the weld under the service conditions is less than or equal to HRC22;) Low-gold steel and martensitic stainless steel weldments shall be subjected to stress relief heat treatment at a temperature not lower than 620°C, and the hardness of the weld must be less than or equal to HRC22;
d) Welding wires, welding rods and other welding materials with a nickel content higher than 1% are not allowed to be used for welding carbon vanadium and low alloy steels described in 5.1.3.
6.2 After heat treatment such as surfacing welding and spray welding of cemented carbide, if the temperature of the base metal exceeds the lower critical temperature, stress relief heat treatment must be carried out to make the hardness of the base metal less than or equal to HRC22.6 Printing marks shall meet the following requirements
a) It is allowed to print low residual stress marks such as dots, wavy lines, smooth U-shaped marks, b) It is allowed to print sharp marks (such as V-shaped) in the low stress area of the component (such as on the outer edge of the flange). Generally, it is not allowed to print sharp marks in high stress areas, otherwise stress relief heat treatment should be carried out at a temperature not lower than 600 after printing. 6.4 Threads processed by mechanical cutting are allowed. Cold-formed threads shall meet the heat treatment and hardness requirements of raw materials in Chapter 5. 7 Material requirements for natural gas surface facilities 7.1. Pressure vessels
7.1.1 Pressure vessels in acidic environments shall be manufactured using appropriate materials listed in Table A1, Table A2 and Table A3 in Appendix A (Standard Appendix), and all parts of square vessels shall comply with the requirements of Chapter 5 and 6. 7.1.2 Pressure vessels shall be made of high-quality low-carbon steel or low-alloy steel with a service strength of less than 360MPa. Rimmed steel shall not be used. 7.1.3 The selection of welding materials for container welds should be based on the principle that the strength of the weld is equal to or slightly higher than that of the parent material, and other mechanical properties are also the same. Excessive weld strength will lead to sensitivity to sulfide stress cracking: 7.2 Gas production and gas gathering pipelines
7.2.1 Gas production and gas gathering pipelines in sour environments should use appropriate materials listed in Table A1 and Table A3 in Appendix A (Appendix to the standard). Gas production and gas gathering pipelines should comply with the requirements of Chapter 5 and Chapter 6. 7.2.2 Gas production and gas gathering pipelines should use high-quality low-carbon steel or low-alloy steel seamless steel pipes with a service strength of less than 360MPa. 7.2.3 The selection of welding materials for pipeline girth welding should meet the requirements of 7.1.3. 7.3 Elastic elements
7.3.1 Elastic elements in sour environments should be made of appropriate materials listed in Table A2 and Table A4 in Appendix A (Appendix to the standard). Elastic elements should comply with the requirements of Chapter 5 and Chapter 6. 7.3.23YC7 can be used when its hardness is less than or equal to HRC57 after solid bath treatment under cold working and aging hardening conditions.
7.4.1 Valves in acidic environments should be made of appropriate materials listed in Table A1, Table A2, Table A4 and Table A5 in Appendix A (Standard Appendix). The various components of the valve should meet the requirements of Chapter 5 and Chapter 6. 7.4.23Cr17N M2N (318) bars, after solution treatment (1130℃±10℃, 2h, water rate), when its hardness is less than or equal to HRC24, can be used to make valves.
7.4.3TC-4 Forged bars can be used to make valve stems after annealing at 750~800℃ or solidification treatment (850~900℃, water)-aging treatment (450~550℃, 2h, air cooling). 7.4.42C13, 25 and 35 forged steels are used as the base, and diamond-based or nickel-based alloys are welded or sprayed as the sealing surface: they can be used to make valve plates, instantaneous flaps, needle-type female valve cores, and reservoirs.
7.4.5WCA and WCB grade carbon turbulent steel castings in GB/T12229 can be used to make valve bodies in the annealed state. 7.4.635CrMo forgings can be used to make valve bodies, valve covers, packing caps, bearing glands, flanges, etc. of wellhead valves after quenching and tempering.
Material category
Material category
Martensitic stainless steel
Material category
Carbon steel
SY/ T 0599-1997
Appendix A
(Appendix to the standard)
Metallic materials for use in sour environments
Table A1 Carbon steel and low alloy steel for use in sour environments
GB/T 699-H988
GB/ T 711-1988
GB/ T 700--1988
GB/ T 710--1991
GB/T 699-1988
GB 713-1986
GB/ T 700--1988
GB 6654—1996
GE 7131986
GB 6654—1996
GB/ T 3077--1988
15, 20
235--D
25, 30,35, 40, 45
35CrMo
Stainless steel for acidic environment
GE/T 1220-1992
GB/ T 4237-- 1992
GB/T 2270—1992
GB/T 12201992
OCr19Ni9
OCr18Ni1Ti
0Cr17Ni12M02
1Cr18Ni9Ti
3Ct17Ni7M02N
Table A3 Pipes for acidic environments
GB 30871982
GR 6479—1986
GB/ T R163-1987
GE 3310--1995
10, 20
10, 20G
10, 20
Valve bodies, valve covers, flanges, bolts, etc.
Equipment and container shells, etc.
Gas gathering pipelines, container shells, etc.
Valve bodies, flanges, bolts, etc.
Parts of instrumentation, pipe bundles of containers
equipment. Shells, etc.
Valves of high-pressure risers and station valves
Door parts
Equipment pipe bundles, gas collection pipelines, etc.
Spray welding alloy powder
Material category
Austenite
Inlaid base alloy
Cobalt base alloy
Titanium alloy
Material category
Cobalt-based cladding electrode
Plasma wet spray
Oxyacetylene fire
Flame spray welding
SY/ T 0599--1997
Table A4 Standards for non-ferrous alloys for acidic environments
GE/ T 2965-18T
GB/ T 523I--1985
Valves. Elastic elements for instruments, etc.
Structural parts and elastic sensitive elements of highly corrosive systems (Has C--276)
T2, T
Valve cores and valve seats of eroded valves
All kinds of valves, high-pressure resistant parts, instrument pressure guides, joint gaskets, etc.
Table A5 Standards for spray welding alloys and cladding electrodes for acidic environments
GB / T 984-1985
JB 3168—82
JB 3168-82
EDCoCr
Nickel-based F12
Drill-based F22
Inlaid FI1bzxZ.net
Drill-based F21
Used for wear-resistant and corrosion-resistant surface standard welding, valve plates, valve cores, brown seats, etc.
Used for coal spraying on the surface of large-area wear-resistant and corrosion-resistant seasonal parts, such as the valve plate of flat valves, etc.After quenching and tempering, 635CrMo forgings can be used to make valve bodies, valve covers, packing caps, bearing glands, flanges, etc. of wellhead valves.
Material category
Material category
Martensitic stainless steel
Material category
Carbon steel
SY/ T 0599-1997
Appendix A
(Appendix to the standard)
Metallic materials for use in sour environments
Table A1 Carbon steel and low alloy steel for use in sour environments
GB/T 699-H988
GB/ T 711-1988
GB/ T 700--1988
GB/ T 710--1991
GB/T 699-1988
GB 713-1986
GB/ T 700--1988
GB 6654—1996
GE 7131986
GB 6654—1996
GB/ T 3077--1988
15, 20
235--D
25, 30,35, 40, 45
35CrMo
Stainless steel for acidic environment
GE/T 1220-1992
GB/ T 4237-- 1992
GB/T 2270—1992
GB/T 12201992
OCr19Ni9
OCr18Ni1Ti
0Cr17Ni12M02
1Cr18Ni9Ti
3Ct17Ni7M02N
Table A3 Pipes for acidic environments
GB 30871982
GR 6479—1986
GB/ T R163-1987
GE 3310--1995
10, 20
10, 20G
10, 20
Valve bodies, valve covers, flanges, bolts, etc.
Equipment and container shells, etc.
Gas gathering pipelines, container shells, etc.
Valve bodies, flanges, bolts, etc.
Parts of instrumentation, pipe bundles of containers
equipment. Shells, etc.
Valves of high-pressure risers and station valves
Door parts
Equipment pipe bundles, gas collection pipelines, etc.
Spray welding alloy powder
Material category
Austenite
Inlaid base alloy
Cobalt base alloy
Titanium alloy
Material category
Cobalt-based cladding electrode
Plasma wet spray
Oxyacetylene fire
Flame spray welding
SY/ T 0599--1997
Table A4 Standards for non-ferrous alloys for acidic environments
GE/ T 2965-18T
GB/ T 523I--1985
Valves. Elastic elements for instruments, etc.
Structural parts and elastic sensitive elements of highly corrosive systems (Has C--276)
T2, T
Valve cores and valve seats of eroded valves
All kinds of valves, high-pressure resistant parts, instrument pressure guides, joint gaskets, etc.
Table A5 Standards for spray welding alloys and cladding electrodes for acidic environments
GB / T 984-1985
JB 3168—82
JB 3168-82
EDCoCr
Nickel-based F12
Drill-based F22
Inlaid FI1
Drill-based F21
Used for wear-resistant and corrosion-resistant surface standard welding, valve plates, valve cores, brown seats, etc.
Used for coal spraying on the surface of large-area wear-resistant and corrosion-resistant seasonal parts, such as the valve plate of flat valves, etc.After quenching and tempering, 635CrMo forgings can be used to make valve bodies, valve covers, packing caps, bearing glands, flanges, etc. of wellhead valves.
Material category
Material category
Martensitic stainless steel
Material category
Carbon steel
SY/ T 0599-1997
Appendix A
(Appendix to the standard)
Metallic materials for use in sour environments
Table A1 Carbon steel and low alloy steel for use in sour environments
GB/T 699-H988
GB/ T 711-1988
GB/ T 700--1988
GB/ T 710--1991
GB/T 699-1988
GB 713-1986
GB/ T 700--1988
GB 6654—1996
GE 7131986
GB 6654—1996
GB/ T 3077--1988
15, 20
235--D
25, 30,35, 40, 45
35CrMo
Stainless steel for acidic environment
GE/T 1220-1992
GB/ T 4237-- 1992
GB/T 2270—1992
GB/T 12201992
OCr19Ni9
OCr18Ni1Ti
0Cr17Ni12M02
1Cr18Ni9Ti
3Ct17Ni7M02N
Table A3 Pipes for acidic environments
GB 30871982
GR 6479—1986
GB/ T R163-1987
GE 3310--1995
10, 20
10, 20G
10, 20
Valve bodies, valve covers, flanges, bolts, etc.
Equipment and container shells, etc.
Gas gathering pipelines, container shells, etc.
Valve bodies, flanges, bolts, etc.
Parts of instrumentation, pipe bundles of containers
equipment. Shells, etc.
Valves of high-pressure risers and station valves
Door parts
Equipment pipe bundles, gas collection pipelines, etc.
Spray welding alloy powder
Material category
Austenite
Inlaid base alloy
Cobalt base alloy
Titanium alloy
Material category
Cobalt-based cladding electrode
Plasma wet spray
Oxyacetylene fire
Flame spray welding
SY/ T 0599--1997
Table A4 Standards for non-ferrous alloys for acidic environments
GE/ T 2965-18T
GB/ T 523I--1985
Valves. Elastic elements for instruments, etc.
Structural parts and elastic sensitive elements of highly corrosive systems (Has C--276)
T2, T
Valve cores and valve seats of eroded valves
All kinds of valves, high-pressure resistant parts, instrument pressure guides, joint gaskets, etc.
Table A5 Standards for spray welding alloys and cladding electrodes for acidic environments
GB / T 984-1985
JB 3168—82
JB 3168-82
EDCoCr
Nickel-based F12
Drill-based F22
Inlaid FI1
Drill-based F21
Used for wear-resistant and corrosion-resistant surface standard welding, valve plates, valve cores, brown seats, etc.
Used for coal spraying on the surface of large-area wear-resistant and corrosion-resistant seasonal parts, such as the valve plate of flat valves, etc.
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