• WYJ008-2006

Certificates

WYJ008-2006 

1. The applicable scope

This technical agreement for Chinese oil dushanzi petrochemical branch import kazakhstan technical renovation engineering of crude oil tank, oil 100000 cubic meters floating roof with 12 oil tank MnNiVR (including 12 MnNiVR-SR) steel plate order.

2. The size, shape, appearance and allow deviation

Steel plate size, shape and allow deviation executive JIS G 3193 rules. The thickness of the steel plate handled deviation executive JIS G 3115 regulations, thickness and negative deviation is 0, thickness tolerance zone whole move up 0.25 mm, steel plate quality theory calculation methods in JIS G 3115 standard based on the thickness of 0.125 mm added value increase.

3. Technical requirements

3.1 chemical composition

The chemical composition of the steel plate (melting analysis) should be in accordance with table 1, finished product analysis and melting analysis of error should be consistent with the provisions of the JIS G 3115.

Table 1

 

chemical composition

(%)

12MnNiVR(include 12MnNiVR-SR)

C

≤0.09

Si

0.15~0.40

Mn

1.20~1.60

P

≤0.015

S

≤0.010

Ni

≤0.40

Cr

≤0.30

Mo

≤0.30

V

0.02~0.06

Pcm

≤0.20

Ceq

≤0.44

 

Note :Pcm(%)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

Ceq(%)=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14

3.2 delivery status

All steel plates are to be heated quenching and tempering offline again after delivery, and steel plate tempering not less than 620 ℃temperature. Tempering steel temperature in quality noted in the certificate.

3.3 mechanical properties

Steel should be driven DOB tensile test, impact test and cold bending test, the test result should comply with the provisions of the table 2.

Table 2

 

mechanical properties

12MnNiVR(include)12MnNiVR-SR)

tensile strength

(N/mm2

610~730

The yield point or yield strength(N/mm2

≥490

Elongation rate A

(%)

≤16mm     5#

≥19

16~20mm   5#

≥26

>20mm     4#

≥19

yield ratio    注1

≤0.90

cold impact test

 

180°d=3a (1#)

Charpy impact test

注2

Three average(J)

≥47

Single minimum(J)

≥33

Test temperature(℃)

-20和-15

Sample shape

2mmV  type

       
 

Note: 1: applicable for thickness 32 mm, 28 mm.

2:-15 ℃to provide value, only in the quality certificate of the state.

 

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