GB/T 713.1-2023Steel plate,sheet and strip for pressure equipments—Part 1:General requirements (English PDF)

3.1 As-rolled; AR; WAR

The state of steel without any special rolling and/or heat treatment.

3.3 Normalizing rolling; +N

A rolling technology in which the final deformation is carried out during the rolling process within a certain temperature range to bring the steel to a normalized state so that the specified mechanical property values can be achieved even after normalizing.

Note: Normalizing rolling and thermomechanical rolling are also called "controlled rolling" in some publications.

3.4 Normalized; N

A heat treatment process in which the steel is heated to austenitization and then cooled in air to obtain a mainly pearlite structure.

3.5 Thermomechanical processed; M

A rolling process in which the final deformation of steel is carried out within a certain temperature range, so as to ensure that the steel obtains properties that cannot be obtained through heat treatment alone.

6.1 Size, shape and allowable deviation

6.2 Weight

6.2.1 Hot-rolled steel plates (except stainless steel) shall be delivered according to theoretical weight or actual weight. The thickness used to calculate the theoretical weight is the arithmetic mean of the maximum and minimum thickness allowed for hot-rolled steel plates. The density of the hot-rolled steel plate calculated from the theoretical weight is 7.85 g/cm³, and the density of the 06Ni7DR and 06Ni9DR hot-rolled steel plates is 7.89 g/cm³.

6.2.2 Stainless-steel hot-rolled and cold-rolled steel plates shall be delivered according to theoretical weight or actual weight. The thickness used to calculate the theoretical weight is the arithmetic mean of the maximum and minimum thickness allowed for stainless steel hot-rolled and cold-rolled steel plates. The density of stainless-steel hot-rolled steel plates and cold-rolled steel plates to calculate the theoretical weight shall comply with the regulations of GB/T 713.7.

6.2.3 Steel strips are delivered according to actual weight.

7.1 Manufacturing method

7.1.1 Steel is smelted by an oxygen converter or an electric furnace, adopting the external refining process. Other smelting methods, as negotiated between the supplier and the buyer and indicated in the contract, may also be used.

7.1.2 The compression ratio of continuous casting billets and steel ingots is not less than 3; the compression ratio of electroslag remelting billets is not less than 2.

7.2 Delivery state

The delivery state is given in the applicable document of GB/T 713 (all parts).

7.3 Chemical composition

7.3.1 Smelting analysis

The chemical composition (smelting analysis) of steel shall comply with the requirements of the applicable document of GB/T 713 (all parts) and be noted on the quality certificate.

7.3.2 Finished product analysis

If the finished product analysis is required during the inquiry and order, the finished product analysis shall be carried out. The allowable deviation of chemical composition of the finished steel plate, sheet or strip shall comply with the provisions of GB/T 222.

Except for the designations specified in GB/T 713.7, the allowable upper deviation of the P content is +0.003% and the allowable upper deviation of the S content is +0.002%.

7.3.3 Carbon equivalent and related indices

7.4 Mechanical properties and technological properties

7.4.1 General requirements

The mechanical properties of steel plates, sheets and strips shall comply with the requirements in the applicable document of GB/T 713 (all parts). If additional heat treatment (such as post-weld heat treatment) is required to test the mechanical properties, it shall be noted in the contract or order.

7.4.2 Tensile properties

7.4.2.1 The tensile properties of steel plates, sheets and strips shall comply with the requirements in the applicable document of GB/T 713 (all parts).

7.4.2.2 The direction of tensile samples of steel plates, sheets and strips shall be perpendicular to the rolling direction (i.e., transverse samples).

7.4.3 Impact properties

7.4.4 Bending properties

7.5 Surface quality

7.5.1 Hot-rolled steel plates, sheets and strips

7.5.1.1 The surface of hot-rolled steel plates, sheets and strips shall be free from bubbles, scrabs, cracks, folds, inclusions, pressed-in oxide scales and other harmful defects that would affect the use. The cross-sections of hot-rolled steel plates, sheets and strips shall not have visible delamination.

7.5.2 Stainless-steel cold-rolled steel strips and sheared steel plates

7.6 Non-destructive testing

Non-destructive testing of steel plates shall comply with the requirements in the applicable document of GB/T 713 (all parts) [see 5.2j)].

7.7 Special requirements

According to the requirements of the buyer and through negotiation between the supplier and the buyer, items 5.2 or 5.3 can be selected for inspection.

8.1 Inspection and type of inspection documents

8.2 Inspection items

Inspection items shall comply with the requirements in the applicable document of GB/T 713 (all parts).

8.3 Sampling

8.3.1 General requirements

Test materials and samples shall be marked in a clear manner to ensure that the sampling master batch and the sampling position of the test material on the master batch can be traced.

8.3.2 Inspection frequency

The inspection frequency of each inspection shall comply with the provisions of the applicable document of GB/T 713 (all parts).

8.3.3 Inspection batch

The inspection batch shall comply with the provisions of the applicable document of GB/T 713 (all parts).

8.4 Preparation of test materials and samples

8.4.1 General requirements

8.4.1.1 Sampling and sample preparation for chemical analysis and mechanical

properties shall comply with the requirements of GB/T 20066 and GB/T 2975. The specific location and direction shall be specified in the applicable document of GB/T 713 (all parts).

8.4.2 Tensile samples

8.4.2.1 The preparation of tensile samples shall comply with the provisions of GB/T 228.1. Except for the circular samples specified in 8.4.2.3, all samples shall be standard rectangular samples.

8.4.2.2 At least one rolled surface shall be retained for rectangular tensile samples. For steel plates complying with GB/T 713.2, GB/T 713.3, GB/T 713.4, GB/T 713.5, GB/T 713.6,

8.4.3 Charpy (V-notch) impact samples

8.4.3.1 The preparation of impact samples shall comply with the provisions of GB/T 229.

8.4.3.2 For steel plates, sheets and strips with nominal thickness t >= 12 mm, standard impact samples of 10 mm × 10 mm × 55 mm shall be prepared from the sample blanks; for steel plates, sheets and strips with nominal thickness 8 mm < t < 12 mm, the small-size sample size is 7.5 mm × 10 mm × 55 mm; for steel plates, sheets and strips with nominal thickness 6 mm <= t <= 8 mm, the small-size sample size is 5 mm × 10 mm × 55 mm.

8.4.3.3 The notch of the impact sample shall be perpendicular to the steel surface.

8.4.4 Bending samples

The preparation of bending samples shall comply with the provisions of GB/T 232, and the specific requirements are specified in the applicable document of GB/T 713 (all parts).

8.5 Re-inspection and determination rules

8.5.1 The re-inspection and determination rules for steel plates, sheets and strips shall be implemented in accordance with the provisions of GB/T 17505.

8.6 Numerical rounding

The inspection and test results of steel plates, sheets and strips adopt the rounding value comparison method, and the numerical rounding rules shall comply with the provisions of GB/T 8170.

9.1 Chemical analysis

9.1.1 Unless otherwise specified, the chemical analysis method shall be determined by the supplier.

9.1.2 If there is a dispute over the chemical analysis method, the test shall be carried out in accordance with GB/T 223 (all parts) or a method approved by both parties.

9.2 Room temperature tensile test

9.2.3 In case of dispute, where permitted (see 8.4.2.3), tensile tests shall be carried out on round samples.

9.3 High temperature tensile test

For steel plates, sheets and strips with high-temperature tensile properties specified in GB/T 713.2, the lower yield strength ReL or the specified plastic elongation strength Rp0.2, tensile strength Rm,

9.4 Low temperature tensile test

The low temperature tensile test method shall be carried out in accordance with the provisions of GB/T 228.3.

9.5 Charpy (V-notch) impact test

9.5.1 Charpy (V-notch) impact test shall be carried out in accordance with the provisions of GB/T 229. When small-size samples are used, the specified minimum impact absorption energy value shall be reduced proportionally to the cross-sectional area of the sample.

9.5.2 The evaluation of Charpy (V-notch) impact test results is as follows. […]

9.6 Thickness direction performance test

The steel plate thickness direction performance test method is carried out in accordance with the provisions of GB/T 5313.

9.7 Bending test

The bending performance test method shall be carried out in accordance with the provisions of GB/T 232.

9.8 Hardness inspection

According to the different sizes and conditions of steel plates, sheets and strips, they can be inspected according to one of the methods of GB/T 230.1, GB/T 231.1 or GB/T 4340.1.

9.11 Drop weight test

The drop weight test method shall be carried out in accordance with the provisions of GB/T 6803, using the P-2 sample.

9.12 Hydrogen-induced cracking resistance test

The hydrogen-induced cracking resistance test shall be carried out in accordance with the provisions of GB/T 8650.

9.13 Intergranular corrosion resistance test

The resistance to intergranular corrosion shall be tested in accordance with the provisions of GB/T 4334 and GB/T 21433, and the evaluation standards shall be specified in the contract. […]