GB 30814-2014Steel plates of carbon steel and low alloy steel for nuclear power plants (English PDF)

4.1 Ordering Information

When ordering, shall provide the following information.

a) number of this standard;

b) grades;

c) specification;

d) the size, shape accuracy requirements;

e) weight;

f) Delivery status;

g) special requirements.

4.2 Tag example

6.1 Designation and chemical composition

6.1.1 Steel grade and chemical composition (melting analysis) shall comply with the requirements in Table 1.

6.1.1.1 nitrogen content in steel should not exceed 0.008%, if the steel contains aluminum, niobium, vanadium, titanium and other alloy elements having nitrogen fixation, Nitrogen content may not be greater than 0.012%, the content of alloying elements shall be indicated in the quality certificate.

6.1.1.2 Steel arsenic, antimony, bismuth, lead, tin content of harmful elements in the individual shall be not more than 0.025%, the total should not exceed 0.05%. Such as supply-side I can guarantee, can not do analysis.

6.1.1.3 should be finished steel chemical composition analysis, the tolerances shall comply with the provisions of GB/T 222's.

6.1.2 thickness greater than 15mm thickness direction of the performance guarantee of various grades steel sheet S element content should be consistent with GB/T 5313 regulations set. Other alloying elements may be required under the agreement between.

6.1.3 agreed between manufacturer and specified in the contract, various grades of steel carbon equivalent (CEV) can be specified in Table 2. Carbon equivalent shall be Composition and melting analysis using the following formula. CEV = C Mn/6 (Cr Mo V)/5 (Ni Cu)/15.

Table 2

Trademark

Carbon equivalent CEV (mass fraction) /% t<=50mm t > 50mm ~ 100mm t > 100mm Q205HD <=0.43 <=0.44 consultations Q230HD <=0.43 <=0.44 consultations Q250HD <=0.43 <=0.44 consultations Q275HD <=0.45 <=0.46 consultations Q345HD <=0.45 <=0.46 consultations Q420HD <=0.48 Consultations If you need to simulate post-weld process (see A.2), carbon equivalent value can be raised.

NB. Male t --- steel sheet thickness.

6.2 Melting Method

By a converter or electric furnace steel smelting, and refining.

6.3 Delivery Status

Hot-rolled steel sheet should, hot tempered, normalized, and tempered, quenched and tempered (Q420HD only) state delivery.

6.4 Mechanical Properties

6.4.1 The mechanical properties of the steel plate shall meet the requirements of Table 3.

6.4.2 The thickness of less than 12mm steel Charpy (V-notch) impact test specimens shall be assisted,> 8mm ~ 7 Test methods Steel sheet of the inspection items, the number of samples, sampling methods and test methods shall be in accordance with Table 4.

Table 4

Test item number of samples/sampling methods Test Method A chemical composition (melting analysis) 1/furnace GB/T 20066 GB/T 223, GB/T 4336, GB/T 20123, GB/T 20125, GB/T 22368 2 chemical composition (product analysis) 1/furnace GB/T 20066 GB/T 223, GB/T 4336, GB/T 20123, GB/T 20125, GB/T 22368

3 Tensile test

Quenched and tempered steel 2/batch Non-quenched and tempered steel 1/batch GB/T 2975 GB/T 228.1 4 impact test 3/batch GB/T 2975 GB/T 229

5 Z direction to the steel thickness reduction of 3/batch GB/T 5313 GB/T 5313 6 size, shape one by one - meet the accuracy requirements of the appropriate measuring tools

8.1 Inspection and acceptance

Steel inspection and acceptance by the supplier and technology supervision department, to be entitled to any of the standard or test items specified in the contract Inspection and acceptance.

8.2 Batch

Plate should be batch acceptance. Each batch should be the same steel grade, the same heat, the same size, the same state and the same heat treatment delivery system Plates. Batch weight of not more than 30t, 30t steel than a single group batches.

For Z provisions to bulk steel performance test as follows. Subject to the requirements of the above-mentioned group batches when S<=0.005%, by weight of each batch of steel is not Greater than 30t, otherwise, Z15 each batch of steel to not more than 25t; Z25, Z35 plates shall be tested by one.

8.3 Reinspection and decision rules

Reinspection and determination 8.3.1 Mechanical Properties when the impact test results of steel does not comply with the provisions of 6.4.3, sample plates shall not acceptance, and then removed from the remainder of the test unit Two sample products, each product in each sample to select a new set of three samples, test results of these two samples shall be qualified, otherwise the Steel batch shall be rejected.

Steel tensile test and retest determination shall comply with GB/T 17505 of.

Reinspection and determination of thickness properties 8.3.2 Thickness properties retest determination shall comply with GB/T 5313's.

8.3.3 Re-heat treatment

Any heat-treated steel plate, if they can not meet the specified requirements for mechanical properties, it can be re-heat treatment. All mechanical testing should be re, and when the steel re-delivery inspection, re-inspection for steel surface defects. Re-heat treatment times should not exceed 2 times.

8.3.4 Other inspection and re-inspection programs judgment

Reinspection other test items and determination of steel shall comply with GB/T 17505 of.

8.4 Mechanical properties and chemical composition of the test results of rounding

Unless otherwise stated in the contract or order, when you need to assess whether the test results meet the specified value, the mechanical properties and chemical composition are given the test results shall be rounded to the number of phase-based digital value consistent with the provisions identified, and its method of rounding provisions shall YB/T 081 will be.

Carbon equivalent formula should press after rounding.

9.1 Packaging

Steel packaging should comply with GB/T 247's.

9.2 Mark

Plates shall be clearly marked with the following contents. The standard number, grade, heat number, specification, steel identification code (item number or lot number), plant Name, factory standard.

9.3 Quality Certificate

Each batch of steel delivery shall be accompanied by a certificate to prove that the steel meets quality standards and order contract, the quality certificate should be consistent GB/T 247 provisions.

Appendix A

(Normative)

special requirements the following additional requirements based on the need to use the demand side, and marked as specified in the contract or agreement, in which case the selected pilot projects should be for the get on.

A.1 vacuum treatment Steel should include a method for smelting melting including vacuum degassing. Unless otherwise agreed with the demand side, shall be responsible for selecting the appropriate Production process.

After A.2 mechanical properties of the test sample blank analog PWHT Before the test, the mechanical properties of the sample with the representatives of acceptance must be below the critical temperature (AC3) The following post weld heat treatment simulation, used Heat treatment parameters (such as temperature range, time and cooling rate) specified in the contract or agreement. Such heat treatment test results shall meet the standards Provisions.

A.3 additional tensile test A.3.1 Non-quenched and tempered steel in addition to requiring a tensile test, it should also be the second tensile test specimens taken from rolled plate, in the former location of another stretched sample probe One end of the iceberg in a direction parallel with the direction of the front sample. Test results of the second sample should conform to this standard.

A.3.2 thickness not less than 50mm of quenched and tempered steel plate Q420HD in addition to the tensile test requirements should be added to take two additional samples in the corner of the steel sheet. And one from the center of the plate thickness, another tight Affixed to the surface. Additional tests must meet the specified performance and the consistency is determined by the supply and demand sides negotiated.

A.4 drop test (for steel plate thickness not less than 16mm) Drop test should be GB/T 6803 will be. Supply and demand sides can sample state, the number of samples and the NDT temperature for consultations.

A.5 high temperature tensile test Agreement by both sides, can be high temperature tensile test. Test temperature and intensity values in Appendix B or can be specified in the agreement or contract.

A.6 destructive testing Agreement by both sides, steel sheet by one non-destructive testing, test method standards and eligibility level specified in the agreement or contract.

Thermal Stress A.7 mechanical test specimen elimination Test specimen shall be heated by gradually heating or even to eliminate thermal stress, the heating temperature range of 595 °C ~ 650 °C or by supply and demand double Party agreement, according to the plate thickness determines the holding time (2.4min/mm), cooled to not more than 315 °C in still air.

A.8 austenite grain size Press the test furnace steel grain size, grain size and to ensure level 5 or finer. For Als (Als) content of not less than 0.015% or aluminum when the (Alt) content of not less than 0.020%, may not be tested.

A.9 non-metallic inclusions Predetermined level of nonmetallic inclusions are. A, Class B is not greater than 2.0, C, Class D is not more than 1.5.

A.10 containment with steel Charpy V-notch impact test of the absorbed energy value Energy absorbed by the agreement between the Security shells steel Charpy V-notch impact tests (horizontal) value choose Table A.1 Regulations Given the impact test temperature shall be specified in the agreement or contract.

Table A.1

Plate thickness h/mm 16 \u003ch<=25 25\u003ch<=38 38\u003ch<=64 h\u003e 64 the average absorbed energy value/J 34 41 54 68 the minimum single value/J 27 34 47 61 Appendix B (Normative) High-temperature tensile mechanical properties on Q275HD and Q420HD steel high temperature tensile test yield strength and tensile strength values in Table B.1.

Table B.1

Grade Thickness/mm tensile test Tensile properties/MPa not less than 100 °C 150 °C 200 °C 250 °C 300 °C 350 °C Q275HD <=150 the yield strength of 240 230,225,215,205,195 Tensile strength of 440 440,440,440,440,440 Q420HD <=250 the yield on the intensity in 380 360,345,335,325,310 Tensile strength 530 530,530,530,530,515 Appendix C (Informative) Related Standard Grade table this standard ASME and ASTM standard grades used in the control table C.1.