Standard No.:	HG/T 20581-2011
English Name:	Specification of materials selection for steel chemical vessels
Chinese Name:	钢制化工容器材料选用规定
Professional Classification:	HG    Professional Standard - Chemistry
Issued by:	MIIT
Issued on:	2011-5-18
Implemented on:	2011-6-1
Status:	superseded
Superseded by:	HG/T 20581-2020 Standard for materials selected of steel chemical vessels
Superseded on:	2021-4-1
Superseding:	HG 20581-1998 Specification for Materials Selected of Steel Chemical Vessels
Language:	English
File Format:	PDF
Word Count:	20000 words
Price(USD):	500.0
Delivery:	via email in 1 business day

1 Scope 1.0.1 This standard specifies the selection, specifications, applicable limit and scope, as well as the application and substitution requirements of new materials and steels produced according to foreign standards. 1.0.2 This standard is applicable to the welding consumables selection for carbon steel, high strength low alloy steel, pearlite heat resistant steel, stainless steel and stainless clad steel plate chemical vessels whose design pressure is not greater than 35.0MPa and design temperature greater than -20 ℃. The materials include rolled metal, forgings, castings and welding consumables. 1.0.3 The selection, specifications and application scope of welding consumables for vessels pressure parts and their accessories shall meet the requirements of this standard. The higher or special requirements for the materials in the design, if any, shall be indicated in the drawings or corresponding documents. 2 Normative References The following documents are indispensable for the application of this standard. For dated references, only the dated edition is applicable to this document. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document. Hexagon Nuts-Product Grade C GB/T 41 Steel Pressure Vessels GB 150 Quality Carbon Structural Steels GB/T 699 Carbon Structural Steels GB/T 700 Steel Plates for Boiler and Pressure Vessels GB 713 Stainless Steel Covered Electrodes GB/T 983 Stainless Steel Bars GB/T 1220 Heat-Resistant Steel Bars GB/T 1221 Stainless Acid-Resistant Steel Castings-Specifications GB/T 2100 Test method for acid resistance of vitrified clay pipe GB 2835 Alloy Structure Steels GB 3077 Seamless Steel Tubes for Low and Medium Pressure GB 3087 Welded Steel Pipes for Low Pressure Liquid Delivery GB 3092 Mechanical Properties of Fasteners GB/T 3098 Wire Rod for Electrode GB/T 3429 Stainless Steel Rods and Wires for Inert-Gas Shield Welding GB 4233 Stainless Steel Wires for Welding GB 4242 Method of 10 Percent Oxalic Acid Etch Test for Stainless Steels GB/T 4334.1 Method of Ferric Sulfate-Sulfuric Acid Test for Stainless Steels GB/T 4334.2 Method of 65 Percent Nitric Acid Test for Stainless Steels GB/T 4334.3 Method of Nitric-Hydrofluoric Acid Test for Stainless Steels GB/T 4334.4 Method of Copper Sulfate-Sulfuric Acid Test for Stainless Steels GB/T 4334.5 Carbon Steel Covered Electrodes GB/T 5117 Low Alloy Steel Covered Electrodes GB/T 5118 Carbon Steel Electrodes and Fluxes for Submerged Arc Welding GB/T 5293 Seamless Steel Tubes and Pipes for High Pressure Boiler GB 5310 Radiographic Testing For Steel Castings GB/T 5677 Seamless Steel Pipe and Tubing Methods for Ultrasonic Testing GB/T 5777 Hexagon Head Bolts-Product Grade C GB/T 5780 Hexagon Head Bolts-Full Thread-Product Grade C GB/T 5781 Hexagon Head Bolts GB/T 5782 Hexagon Head Bolts-Full Thread GB/T 5783 Hexagon Head Bolts; Reduced Shank; Product Grades B GB/T 5784 Hexagon Nuts, Style 1 GB/T 6170 Hexagon Nuts, Style 2 GB/T 6175 Seamless Steel Tubes for High-Pressure for Chemical Fertilizer Equipments GB 6479 Carbon Steel Castings Suitable for Welded Structure GB/T 7659 Steel Tubes-The Inspection Method on Eddy Current Test GB/T 7735 Welding Electrodes and Rods for Gas Shielding Arc Welding of Carbon and Low Alloy Steel GB/T 8110 Seamless Steel Tubes for Liquid Service GB/T 8163 Heat Resistant Steel Castings GB/T 8492 Penetrant Testing for Steel Castings GB/T 9443 Magnetic Particle Testing for Steel Castings GB/T 9444 Seamless Steel Tubes for Petroleum Cracking GB 9948 Carbon Steel Castings for General Engineering Purpose GB/T 11352 Welded Stainless Steel Pipes for Liquid Delivery GB/T 12771 Low Alloy Steel Electrodes and Fluxes for Submerged Arc Welding GB/T 12470 Steel Wires for Melt Welding GB/T 14957 Stainless Steel Seamless Tubes for Fluid Transport GB/T 14976 Nickel and Nickel Alloy Wires and Rods GB/T 15620 Stainless Steel Electrodes and Fluxes for Submerged Arc Welding GB/T 17854 Stainless and Heat-resisting Steels-Designation and Chemical Composition GB/T 20878 Detecting Susceptibility to Intergranular Corrosion in Stainless Steel Pressure Vessels GB/T 21433 Stainless Steel Plate, Sheet and Strip for Pressure Equipments GB 24511 Specification for Carbon Steel Castings for Pressure Vessels HG/T 2741 Welded Austenitic Stainless Steel Tubes HG 20537 Specification of Design Base for Steel Chemical Vessels HG/T 20580 Copper and Copper Alloy Wires and Rods JB 2736-1980 General Specifications for Open Die Forgings on Hammer JB/T 4385.1 Carbon and Low - Alloy Steel Forgings for Pressure Vessels JB 4726 Stainless Steel Forgings for Pressure Vessels JB 4728 Nondestructive Testing of Pressure Equipments JB/T 4730 Technical Permission of Steel Welding Rod Purchasing for Pressure Vessels JB/T 4747 Welding Procedure Qualification for Steel Pressure Vessels JB 4708 Material Selection Guideline for Design of Major Equipment in Key Units Processing Sour Crude Oil SH/T 3096 Stainless Steel Rods and Wires for Inert-Gas Shield Welding YB/T 5091 Stainless Steel Wires for Welding YB/T 5092 Supervision Regulation on Safety Technology for Stationary Pressure Vessel TSG R0004-2009 3 Terms and Definitions For the purposes of this standard, the terms and definitions established in "Steel Pressure Vessels" GB 150 and "Specification of Design Base for Steel Chemical Vessels" HG/T 20580 and the following ones apply. 3.0.1 Carbon steel It refers to the iron carbon alloy, without other intentionally-added alloy elements (elements such as Si and Al may be added for the purpose of deoxygenation), whose manganese content is less than or equal to 1.20 % and carbon content is less than or equal to 2.0 % . Low carbon steel generally refers to the carbon steel whose carbon content is less than or equal to 0.25 %. 3.0.2 Low alloy steel It refers to the alloy steel formed by adding a small amount of alloy element in the carbon steel mainly for the purpose of increasing the steel intensity and improving the combination properties, including low-alloy structural steel, high strength low alloy steel and pearlite heat resistant steel. Low-carbon and weldable low-alloy structural steels are frequently used in chemical vessels. 3.0.3 Pearlite heat resistant steel It refers to the low-carbon pearlite heat resistant steel added with such alloy elements as chrome (≤10%) and molybdenum mainly for the purpose of improving the heat-resistant and hydrogen-resistant property of steels. 3.0.4 Stainless steel It refers to the alloy steel stainless in the atmosphere whose nominal chrome content is greater than or equal to 13%. It may be classified into the ferritic stainless steel, austenitic stainless steel, duplex stainless steel, martensitic stainless steel and so on according to the metallographic structure of steel at ordinary temperature. 3.0.5 Austenitic stainless steel It refers to the stainless steel whose metallographic structure is mainly austenite at ordinary temperature. 3.0.6 Ferritic stainless steel It refers to the stainless steel whose metallographic structure is mainly ferrite at ordinary temperature. 3.0.7 Duplex stainless steel It refers to the stainless steel with about half ferritic phase and austenitic phase in the solid quenching (metallographic) structure at ordinary temperature. 3.0.8 Ferritic steel It is the generic term of carbon steel, high strength low alloy steel, pearlite heat resistant steel and ferritic stainless steel. 3.0.9 Pressure parts They refer to the spare parts directly bear the pressure of substances, such as cylinder, head, spherical shell, nozzle, flange and tube plate. 3.0.10 Non-pressure parts

1 Scope 2 Normative References 3 Terms and Definitions 4 General 5 Principles for Selection of Steels 6 Specifications of Steels 7 Applicable Limit and Scope of Steels 8 Welding Consumables 9 Apprasial and Application of New Materials 10 Application of Steels with Foreign Specification Number 11 Substitution of Steels Annex A (Informative Annex) Mechanical Properties of Commodity Grade Bolts Annex B (Informative Annex) Composition and Properties of Some Special Welding Consumables Annex C (Informative Annex) Nickel and Nickel Alloy Welding Consumables Annex D (Informative Annex) Welding Consumable Selection Table for Different Material Welding Between Carbon Steel, Stainless Steel and Nickel Alloy Annex E (Informative Annex) Welding Consumable Selection Table for Different Material Welding Between Carbon Steel, Stainless Steel and Copper Alloy