GB/T 34560.1-2017Structural steels -- Part 1: General technical delivery condition for hot-rolled products (English PDF)

6.3 The size, shape, weight and tolerance of hot-rolled steel plate and strip

shall comply with the provisions of GB/T 709.

6.4 The size, shape, weight and tolerance of hot-rolled H-section steel and

some T-shaped steel shall comply with the provisions of GB/T 11263.

6.5 After negotiation between the supplier and the purchaser, the steels of

other sizes, shapes and tolerances can be supplied.

7.1 Smelting method

Unless otherwise specified in the contract or order, the smelting method of steel is generally selected by the supplier in accordance with the requirements of individual parts of GB/T 34560. After negotiation between the supplier and the purchaser, and indicated in the contract, other smelting method can be used.

7.2 Delivery status

The delivery status is given in individual parts of GB/T 34560. In accordance with the requirements of individual parts of GB/T 34560, the delivery status is specified by the purchaser and specified in the contract.

7.3 Chemical composition

7.5.1.3 Steel surface defects are allowed to be removed by grinding or other methods. The clearance shall be smooth and free of edges. The clearance depth shall not be greater than the negative deviation of the thickness of the steel plate, and the minimum allowable thickness of the steel plate shall be guaranteed.

7.5.1.4 For the defect on the surface of the steel plate that cannot be cleaned according to the provisions of 7.5.1.3, after negotiation between the supplier and the purchaser, welding repairs can be performed in accordance with the following requirements:

a) use appropriate welding methods;

b) completely remove the harmful defects on the steel plate by using shoveling or grinding equal methods before welding; the depth of the removed part is within 20% of the nominal thickness of the steel plate; the total area of one-sided dressing shall be within 2% of the area of the steel plate;

c) there must be no undercut or overlap on the edge of the welded area of the steel plate; the stack height shall be more than 1.5mm above rolling surface, then use a shovel or mill to remove pile height;

d) heat treatment plate shall be heat-treated again after welding.

7.5.1.5 After negotiating between the supplier and the purchaser, the surface

quality of the steel plate can also comply with the requirements of GB/T 14977.

7.5.2 Steel strip and its shear steel plate

7.5.2.1 The surface of the steel strip shall not have defects such as scars, cracks, folds, inclusions, bubbles, and intrusion of the oxide scale, etc., which are harmful to the use. Strips shall not have visually visible layers.

7.5.2.2 The surface of the steel strip is allowed to have partial defects such as thin oxide scale, rust and minor pits, scratches, etc. that do not affect the use. The unevenness shall not exceed half of the thickness tolerance of the strip, and the minimum allowable thickness of the strip shall be guaranteed.

7.5.2.3 The steels are allowed to be delivered with partial defects, but the defective part shall not exceed 6% of the total length of each strip.

7.5.2.4 After negotiations between the supplier and the purchaser, the surface

quality of the sheared steel plate can also be implemented in accordance with the provisions of GB/T 14977.

7.5.3 Section steel

shall not be less than 10 mm.

8.4.3 Charpy (V-notch) impact specimen

The preparation of impact test specimens shall meet the requirements of GB/T

229. Steels with a nominal thickness of not less than 12 mm or a nominal diameter of not less than 16 mm shall be prepared from specimens with 10mm

× 10mm × 55mm standard impact specimens. Steels with a nominal thickness of 6mm ~ 12mm or a nominal diameter of 12mm ~ 16mm require processing of small-size specimens (10mm × 5mm × 55mm or 10mm × 7.5mm × 55mm).

Impact specimen notch shall be perpendicular to the steel surface.

8.4.4 Bending specimen

Preparation of bending specimens shall comply with the provisions of GB/T 232, the specific requirements specified in individual parts of GB/T 34560.

8.5 Re-inspection and determination rules

8.5.1 The re-inspection and determination rules of section steel are carried out according to GB/T 2101.

8.5.2 The re-inspection and determination rules of other steels shall be carried out according to the provisions of GB/T 17505.

8.5.3 When the results of the Charpy (V-notch) test of the steel material are unqualified, the unqualified specimen steel shall be scrapped. Then retake 2 specimens of steel from the remaining steel in the inspection lot. Select a new set of 3 specimens on each specimen steel. The test results of these two sets of specimens shall meet the requirements of 9.3.2a). At this point, 9.3.2b) is no longer applicable.

8.5.4 The analytical values of chemical analysis and mechanical properties

use rounding off comparison method. The numerical rounding rules shall meet the requirements of GB/T 8170.

9.1 Chemical analysis

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

9.1.2 If there is a dispute over the chemical analysis method, the wet method

[such as GB/T 223 (all parts)] or the methods approved by both parties shall be tested.

Chinese Standards

This is an excerpt of the PDF (Some pages are marked off intentionally)

Full-copy PDF can be purchased from 1 of 2 websites:

nu SEARCH the standard ID, such as GB 4943.1-2022.

nu Select your country (currency), for example: USA (USD); Germany (Euro).

nu Full-copy of PDF (text-editable, true-PDF) can be downloaded in 9 seconds.

nu Tax invoice can be downloaded in 9 seconds.

nu Receiving emails in 9 seconds (with download links).

nu SEARCH the standard ID, such as GB 4943.1-2022.

nu Full-copy of PDF (text-editable, true-PDF) can be downloaded in 9 seconds.

nu Receiving emails in 9 seconds (with PDFs attached, invoice and download links).

Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)

Linkin: https://www.linkedin.com/in/waynezhengwenrui/

------ The End ------