Certificates
WYJ036-2005 07MnCrMoVR
1, applicable scope
The technology conditions can only be used for YuLi east aromatics project 2000 m3LPG spherical tank MnCrMoVR steel plate with the order.
2, the reference standard
GB19189 pressure container with the quality high strength steel plate
GB/T709 hot-rolled steel plate and steel strip shape, size, weight and allow deviation
GB/T247 steel plate and steel with acceptance, packaging, sign and quality certificate the general rules
GB/T222 steel chemical analyses of the sampling method and finished with the chemical composition allow deviation
GB/T2975 steel and steel products mechanical test sampling location and samples preparation
GB 6654 pressure vessel USES of the steel plate
JB 4730 pressure vessel NDT
3, size, shape, quality and allow deviation
Steel plate size, shape, quality and allow deviation according to GB/T709 and GB6654 regulation, including steel, the roughness not more than 6/1000.
4, technical requirements
4.1 chemical composition
The chemical composition of steel (melting analysis) should be in accordance with table 1, finished product analysis and melting analysis of error should be consistent with the GB/T222 rules.
Table 1
|
（Material name）
Chemical composition％
|
07MnCrMoVR
|
|
C
|
≤0.09
|
|
Si
|
0.15～0.40
|
|
Mn
|
1.20～1.60
|
|
P
|
≤0.020
|
|
S
|
≤0.010
|
|
Ni
|
≤0.40
|
|
Cr
|
0.10～0.30
|
|
Mo
|
0.10～0.30
|
|
V
|
0.02～0.06
|
|
Pcm
|
≤0.20
|
|
PSR
|
＜0.00
|
Note ：1.Pcm(%)=C+Si/30+Mn/20+Cu/20+ Ni/60+Cr/20+ Mo/15+V/10+5B
PSR(%)=Cr+Cu+2Mo+10V+7Nb+5Ti-2
2. Allow the other add trace alloy element outside the watch. The supplier shall ensure that added outside table 1of the alloy elements included in the melting of trace analysis Pcm results.
3. PSR value needs to assure, can appear in DOB .
4.2 delivery status
All steel plates are to be conditioning heat treatment (quenching and tempering) bofore the delivery, and tempering temperature not less than 610 ℃.
4.3 mechanical properties
Steel should be finished tensile test by piece, impact test and cold bending test, the test results shall be in accordance with table 2 regulations.
Table 2
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Material name
mechanical property
|
07MnCrMoVR
|
|
tensile strength
Rm(N/mm2)
|
610～730
|
|
Yield Rel(N/mm2)
|
≥490
|
|
Elongation A(%)
|
≥17
|
|
Cold bend test
|
B=2a 180°d=3a
|
|
Charpy impact test energy注
|
Three average（J）
|
≥50
|
|
Allow a single minimum（J）
|
≥35
|
|
Test temperature（℃）
|
-20
|
|
Sample shape
|
2mmVtype
|
Note 1: the impact of the axis should be located the thickness of the steel plate 1/4, provide the thickness of the steel plate handled the impact of the measured value in 1/2 performance.
4.4 sample heat treatment
07 MnCrMoVR steel plate mechanical properties by simulating the after welding test after heat treatment, heat treatment system simulation after welding table 3 shows. The supplier should provide the steel plate performance simulation of heat treatment after welding after mechanical properties test data, and the results should comply with the provisions of the table 2.
Table 3
|
serial number
|
item
|
Control scope
|
|
1
|
Heattreatmenttemperature
|
565±15℃
|
|
2
|
Holding temperature
|
100min
|
|
3
|
Rate of temperature
|
50～80℃/hr
|
|
4
|
cooling rate
|
≤150℃/hr
|
Note: before the temperature rise to 300 ℃didn't control the rate of temperature.
Cooled to 300 ℃later natural cooling, but not allow nasty cold.
;)
