Certificates

WYJ031-2006  P265GH（20HR）、P265GH（20HR－B）

1. applicable scope

Thetechnology conditions apply to P265GH (20 HR) steel plate and RCC-M 2, 3 class equipments with P265GH (20 HR-B) steel plates.

P265GH (20 HR) steel plate should comply with the 0401 JT033 the steel lining the secure with carbon steel plate purchasing technical conditions "regulation, such as and 0401 JT033 have a conflict of this agreement shall prevail.

P265GH (20 HR-B) steel plate should comply with the 0401 JT302 (0015302 T) "2, 3 class equipments with the carbon steel and the low alloy steel plate and technical conditions" regulation, such as and 0401 JT302 have a conflict of this agreement shall prevail.

2. The size, shape, weight and allow deviation

2.1 steel plate of length, width deviation should be allowed to meet the provisions of the GBT / 709

2.2 the thickness of the steel plate deviation should be allowed to meet the provisions of the GBT6654

2.3 plates shall be ordered to theoretical weight delivery, according to the provisions of the GBT6654 added value to the thickness of the weight calculation theory.

2.4 steel plate roughness must not be more than the provisions of the table 1.

3. Technical requirements

3.1 the smelting steel plate and finished products should comply with the analysis of the analysis of the provisions of the table 2

Table 1 Steel plate roughness requirements

 

nominal thickness mm	The roughness measurement requirementsmm	roughness mm
8～＜15	1000	7
	2000	11
15～＜25	1000	7
	2000	10
25～＜40	1000	6
	2000	9
≥40	1000	5
	2000	8

Table 2 HRThe chemical composition of the steel plate％

 

element	C ≤	Si ≤	Mn	P ≤	S ≤	TAL ≥	Cr ≤	Cu ≤	Mo ≤	Nb ≤	Ni ≤	Ti ≤	V ≤
Melting analysis	0.20	0.40	0.80 -1.40	0.025	0.015	0.020	0.30	0.30	0.08	0.02	0.30	0.03	0.02
Product analysis	0.22	0.45	0.75 -1.50	0.030	0.018	0.015	0.35	0.35	0.11	0.03	0.35	0.04	0.03

Note: heat  analysisCr＋Cu＋Mo＋Ni≤0.75％，product analysisN≤0.014％，product analysis AL/N≥2

3.2 smelting andcasting method

By electric furnace and furnace + steel refining outside the furnace method smelting, casting the calm.

3.3 delivery state

Steel should be in 89-950 ℃is the delivery after normalized, normalized temperature and holding time should be indicated in the quality certificate.

3.4 35 mm thickness of  "of steel, in the delivery of the state mechanical performance and process performance should comply with the provisions of the table 3; For thickness of 35 mm steel specimen after welding simulation of heat treatment, heat treatment after welding sample simulation state of the mechanical properties and process performance should comply with the provisions of the table 3.

Table 3  20 HR steel plate mechanical performance and process performance

 

Steel Thickness t mm	tensile property			impact properties		180°bending test
	ReH，Mpa	Rm，Mpa	A，％	Test temperature	Akv，J	B=35mm
t≤16	≥265	410-530	≥22	-20℃	≥27	D=1a
16＜t≤40	≥255
40＜t≤60	≥245
60＜t≤100	≥215
100＜t≤150	≥200	400-530

Note: (1) the transverse direction; (2) three impact allows only a sample of the test results lower than average, but shall not be lower than the average of 70% (3) when the width of 7.5 mm or 5 mm of small sample, impact energy should be not less than the average respectively in the table of the rating of 75% or 50% (4) to 6-10 mm thickness of the steel plate, plate ReH should not more than 343 Mpa.

3.5 sample simulation system after welding heat treatment are as follows

Holding time: 600±5 ℃

Holding time: according to the stipulated in the contract

In the more than 400 ℃temperature of heating and cooling rate not more than the following values of the larger value: 220 ℃/ h divided by the thickness of the steel plate handled by 25; 55 ℃/ h.