JlS G 3467-1988 steel pipe for heating furnace

GB 3467-1988 Steels for Heating Furnace Welded Pipes

This article is Part 1 of GB 3467-1988 Steel for Heating Furnace Welded Pipes.

1 Scope

This standard specifies the classification, code,designation,chemical composition and mechanical properties of steel bar for electric furnace welding tube.

2 Normative references

The following documents are indispensable for the application of this standard. For the date of the reference documents, only the ones indicated were approvd at the time of the standard formulation. Any amendment to the latest reference documents or any new reference document will be subject to the announcement of this page.

3 Classification and code

3.1 Classification

Heating furnace welded tube steels are divided into four categories.

Category 1. Steel of top grades Q195, Q215, Q235.

Category 2. Steel of second grade 20, 0Cr13, 0Cr17Ni12Mo2.

Category 3. Steel of steel of low alloyed steels: 16Mn, 09MnV、20Mn2、30Mn5、40Mn2.

Category 4. Steel of stainless steel: 0Cr18Ni9,1Cr18Ni9, 0Cr17Ni12Mo2.

3.2 Code

Grade Code

Q195 GB 8162-87

Q215 GB 8162-87

Q235 GB 8163-87

0Cr13 GB 1220-92

20 GB 1221-92

0Cr17Ni12Mo2 GB 4238-92

16Mn GB 6479-86

09MnV GB 6478-86

20Mn2 GB 2377-90

30Mn5 GB 6479-86

40Mn2 GB 7228-86

0Cr18Ni9 GB 1220-92

1Cr18Ni9 GB 1220-92

4 Designation

Each category steel is represented by code and grade, preceded with Chinese characters of “heating furnace welded tube”, four digit number indicating the categories are followed by the code and grade .

5 Chemical composition

5.1 Types, chemical compositions and mechanical properties for the thick-walled steel for heating furnace welded tube are given in table 1.

5.2 For the steel not specified in this standard, their chemical compositions may be agreed upon between the supplier and the purchaser.

6 Steel sampling, analysis and delivery

6.1 Sampling

Sampling should be conducted according to the provision of GB 222-84.

6.2 Analysis

Chemical composition should be analysed according to the provisions of GB223-84 or in agreement between supplier and purchaser.

6.3 Delivery

The supplier should provide steel certificate indicating heat grade, chemical composition, heat treatment and mechanical properties as specified in this standard.

Table 1 Chemical compositions and mechanical properties

This standard is applicable to the manufacture of carbon steel, carbon manganese steel, low-alloy steel and austenitic stainless steel various specifications of seamless steel pipe for heating furnace.

The chemical composition of the steel pipe should conform to the chemical requirements in table 1. The mechanical properties of the steel pipe should meet the requirements in table 2. Physical properties and testing standards should meet the requirements in table 3.

The steel pipe should be manufactured by hot or cold rolling, or by hot extrusion pprocedure. The surface of the steel pipe should be free from defects and should not produce marks when marked by a pen. For details about the surface quality, size range and marking of the steel pipe, please refer to table 4, table 5 and table 6 respectively.

Relevant emery paper should be prepared in each stage of production process, with grade P240-P600. Based on the chemical composition of the steel and the surface quality, proper annealing temperature should be selected. In addition, annealing of the steel pipe should be carried out in a reducing atmosphere. For details, please refer to table 8.

The production process of the steel pipe should adhere to the requirements in table 9, including system rules, heat treatment process, quenching and tempering process, precision rolling, inspection and testing and other contents.

This standard is applicable for use in heating furnace, fire proofing material and other fields which requires application of steel pipes.