WYJ038-2006                        P265GH、P295GH

1.applicable scope

The technology conditions apply to nuclear power project nuclear carbon steel plates.

4.3 delivery status

Steel normalized or quenching and tempering state delivery

4.4 simulation test after welding heat treatment state level the mechanical properties of the process performance should be consistent with the table 3, the provisions of the table 4, test for horizontal direction. If you have special request, after both parties indicated in the contract.

 

 

Table 3

Steel grade	Steel Thicknesst mm	tensile property			180°bend test
		ReH，MPa	Rm，MPa	A，％	b＝35mm
P265GH	t≤16	≥265	410~530	≥23	d=2a good condition
	16＜t≤40	≥255
	40＜t≤60	≥245
	60＜t≤100	≥215		≥22
	100＜t≤150	≥200	400~530
P295GH	t≤16	≥295	460~580	≥22	d=2a good condition
	16＜t≤40	≥290
	40＜t≤60	≥285
	60＜t≤100	≥260		≥21
	100＜t≤150	≥235	440~570

 

Table 4 The impact toughness of the steel plate requirements

Steel grade	Test temperature	Surface samples	Internal sample
P265GH	-20℃	≥27J	≥19J
P295GH	-20℃	≥21J	≥16J

Note: (1) three impact allows only a sample of the results of the tests of below average, but shall not be lower than the average of 75%; (2) 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%.

4.5 V writing impact axis perpendicular to the gap rolling surface, for different thickness, according to the following requirements sampling:

 

（1）plate thickness t＜30mm ，Sample distance rolling surface＜2mm；

（2）plate thickness＞30mm ，Take two sample group, a group from the steel plate surface, sample distance rolling surface＜2mm；A group of from internal steel plate, sampling location for：30mm＜t≤50mm，Sample axis is located in one half of the thickness of the steel plate handled；50＜t≤80mm，Located in the thickness of the steel plate handled by a third of the axis place；若t＞80mm，Sample axis is located in a quarter of the thickness of the steel plate handled。

4.6Sample simulation after welding heat treatment system

ramp rate ：In the less than 400 ℃temperature of heating and cooling rate shall be according to the following provisions，plate thickness ＜25mm ，rate <220℃/h；plate thickness≥25mm ，No more than the following values of speed higher values；220℃/h

divide steel thickness then multiply 25；55℃/h。

holding temperature：600±5℃

hold time：According to the stipulated in the contract。