GB/T 11352-2009Carbon Steel Castings for General Engineering Purpose (English PDF)

4.1 Manufacturing

Unless otherwise stated, the Supplier shall determine steel-making method and casting technology.

4.3 Mechanical property

Mechanical property shall be in accordance with the provisions of Table 2. If the purchaser has no requirement toward the shrinkage factor of cross-sectional area and impact ductility, the Supplier can choose one of them.

Note 1: Property of each designation listed in the Table adapt to castings less than 100 mm in thickness. When casting thickness exceeds 100 mm, Rch(Rp0.2) yield strength specified in the Table is only for design. Note 2: In the Table, gap of the sample of impact absorption (Aku) is 2mm.

4.4 Heat treatment

4.4.1 Unless otherwise stated, the Supplier shall determine heat treatment technology by itself.

4.4.2 Heat treatment for castings shall be carried out according to GB/T 16923 and GB/T 16924.

4.5 Surface quality

Roughness of cast surface shall be in accordance with requirements of drawing or order agreement.

Surface blemish harmful to regular service of casting shall not exist.

4.6 Geometric shape, dimension, dimensional tolerance, machining allowance

Geometric shape, dimension, dimensional tolerance, machining allowance of casting shall be in accordance with provisions of drawing or order agreement, or comply with those specified in GB/T 6414 if there is no drawing or order agreement.

4.7 Repair welding

The Supplier can carry out repair welding for casting defect but the repair welding shall not affect the mechanical property hereof.

4.8 Straightening

Distortion of casting can be removed through straightening.

5.2 Mechanical test

5.2.1 Test block

5.2.1.1 Block for mechanical property test shall be separately casted or be attached to castings during the casting process. Provided that test blocks are attached to castings, the position, method and mechanical property of attached castings shall be determined according to the negotiation between supplier and purchaser. Unless otherwise stated, types of test block shall be selected by the supplier.

5.2.1.2 Shape and dimension of separately-cast test block, as well as sampling location shall be in accordance with the requirements of Figure 1.

5.2.1.3 Shape, dimension and sampling location of attached test block shall be determined by supplier and purchaser through negotiation.

5.2.1.4 Unless otherwise stated, it is required to carry out the same method of heat treatment to both separately-cast test block and the casting it represents, and make relevant recordings.

5.2.1.5 Before heat treatment for castings, if purchaser or its representative requires to join in to test and mark on casting, supplier shall not cut off the attached test block completely. Attached test block shall be marked after heat treatment.

5.2.3 Impact test

Impact test shall be carried out according to the provisions of GB 229.

5.3 Surface inspection

5.3.1 Roughness degree of casting surface shall be inspected according to GB/T 15056.

5.3.2 Shape and dimension inspection of castings shall be carried out with appropriateprecision testing tools, gauge, template or line-marking inspection.

6.1 Inspection routine

Unless otherwise stated, test for castings shall be carried out by the quality department of supplier.

6.2 Place of inspection

6.2.1 Unless both parties agree to carry out the tests at place of the purchaser, the final test shall usually be carried out at the place of the supplier.

6.2.2 If the supplier cannot provide necessary instrument or both parties have dispute toward casting quality, test can be carried out at an independent agency.

6.3 Division of batch

6.3.1 Classified according to furnace number: castings that are casted of same-furnace and treated with same-heat treatment shall be classified as one batch.

6.3.2 Classified according to quantity or weight: under the condition of stable smelting process, the castings of the same designation from several furnaces and through the same multi-furnace heat treatments will be divided as a batch with certain quantity or weight. The specific requirement shall be determined through negotiation between the supplier and purchaser.

6.3.3 Classified according to pieces: one casting can be classified as a batch.

6.4 Analysis of chemical composition

It is required to analyze chemical composition of casting according to melting furnace number or each batch; analysis result shall be in accordance with the provisions of Table 1.

6.5 Inspection for mechanical property

6.5.1 In tensile test, one tensile sample shall be taken from each batch of castings; the test result shall be in accordance with the provisions of Table 2. 6.5.2 As for the impact test, three samples shall be taken from each batch of castings. Mean values of the three samples shall be in conformity with those specified in Table 2; […]

6.7 Re-heat treatment

When result of mechanical property re-inspection does not meet the provisions of Table 2 still, it may carry out re-heat treatment on castings and test the blocks again; […]

7.1 Mark and certificate of conformity

7.1.1 Some or all of the following marks shall be marked on non-working surface of each casting, such as: c) Other signs required by the purchaser. If it is impossible to mark on casting, marks can be printed on label and attached to each batch of casting. 7.1. […]

7.2 Surface protection, packaging, transportation and storage

Casting shall be packed and treated with protective treatment after passing test.

Cast surface protection, transportation and storage shall meet order agreement.

8.2 Chemical analysis of residual element

Whether the chemical analysis is carried out on residual element of Table 1 shall be determined by both parties.

8.3 Brinell hardness

The position and hardness range of metallic Brinell hardness test shall be determined by supplier and purchaser through negotiation. Brinell hardness test shall be carried out according to those specified in GB/T 231.

8.5 Test lug

When the standby test block is insufficient, it is allowable to sample from casting. Sampling location and the performance index shall be determined by both parties through negotiation.

8.6 Major defect welding repair

8.6. […]

8.7 Non-destructive tests

8.7.2 Magnetic particle inspection

Defect of cast surface and near-surface shall be tested through magnetic particle inspection. Defect degree and acceptance level of tested surface shall be determined by both parties through negotiation or comply with those specified in GB/T 9444.

8.7.3 Ultrasonic detection

Interior and near surface defects of the casting shall be tested through ultrasonic detection. Detection scope, defect degree and acceptance level shall be determined by both parties through negotiation or comply with those specified in GB/T 7233.

8.8 Radiograph detection

Defect of casting interior with shall be tested with X-ray or γ-ray. The test scope, defect degree and acceptance level shall be determined by both parties through negotiation or comply with those specified in GB/T 5677.

8.9 Test for proof-pressure compact degree

8.9.1 Test for proof-pressure compact degree shall be carried out on the raw castings or processed castings. Unless otherwise stated, the explanation of test condition (testing pressure, liquid temperature and testing time) and test results shall be executed according to relevant regulations.

8.9.2 Casting for proof-pressure test cannot be oxidized before testing, and also cannot be treated with any protective paint, coating cladding and penetrating.

A.1 Routine inspection

A.1.1 Definition

Routine inspection means that the supplier may test casting or test block casted through separate production flow but with same manufacturing process. However, it is unnecessary to test the practically submitted test blocks or castings.

A.1.2 Documents

A.1.2.1 Certificate of conformity (SC)

In these documents, the supplier shall explain that the submitted castings are in accordance with requirements of order agreement.

A.1.2.2 Test report (TR)

In these documents, the supplier shall explain that submitted castings are in accordance with requirements of order agreement and provide test result of routine inspection.

A.2 Specified inspection

A.2.1 Definition

Specified inspection means inspection and test routine to submitted test block or casting so as to verify whether the said casting is in accordance with requirements of order agreement.

A.2.2 Documents

A.2.2.1 Certificate for inspection

Certificate for inspection shall include all specified test result. Test routine shall include:

c) Executed by an independent agency, and signed by the representative of the agency (ICP).