Certificates

WYJ038-2000           RQ65(12CrMoNi)

1, the technology conditions apply to 8-100 mm thick RQ65 (12 CrMoNi) of steel.

2, the steel plate size and shape, weight and allow deviation in addition to GB709-88 standard should be consistent with the specified, the thickness of the steel plate deviation execute the following regulation: less than 40 mm thickness steel plate, negative deviation is 0.5 mm, 40 mm steel plate thickness frequency, negative deviation is 1.0 mm, steel, the tolerance zone GB709-88 executive rules.

3, technical requirements

3.1 chemical composition

The chemical composition of the steel plate (melting analysis) should be in accordance with table 1.

Table 1  wt%

 

C	Si	Mn	Cr	Mo	V	Ni	Nb	P	S
0.09 ～0.15	0.17 ～0.40	0.90 ～1.30	0.40 ～0.70	0.20 ～0.30	0.04 ～0.12	0.70 ～1.00	0.02 ～0.06	≤0.030	≤0.030

Note: finished analysis should proceed inspection by furnace, the results should comply with the provisions of the GB222.

3.2 delivery status: the steel plate with normalizing + tempering state to delivery

3.3 mechanics and process performance

3.3.1The room temperature and low temperature steel track the mechanics and process performance should comply with the provisions of the table 2.

Table 2

 

thickness mm	tensile test			impact test J		180℃ cold bend
	σs MPa	σb MPa	δ5 %	－10℃	－40℃
8-25	≥460	≥635	≥16	≥68	≥28	d=3a
26-80	≥415	≥620	≥16	≥68	≥28	d=3a
81-100	≥385	≥620	≥16	≥68	≥28	d=3a

Note: (1) the table 2 AKV is the arithmetic mean OFthe three samples of, allow one of the single value below table 2 of the rating value, but may not be less than 70% of the rating value.

(2) less than 12 mm thickness of steel, do not do the impact test.

3.3.2High temperature performance of the steel plate should comply with the provisions of the table 3, the temperature should be indicated in the contract.

Table 3

 

thickness mm	High yield strength σ0.2   MPa
	350℃	400℃	450℃	500℃
8-25	365	350	345	315
26-80	345	330	330	300
81-100	300	290	290	265

Note: less than 14 mmthickness of steel, do not do the high temperature tensile test.