1. 牌號 Grade 3Cr2W8V/SKD6/1.2581/H21/X30WCrV9-3
|
GB |
DIN |
W-Nr. |
AISI |
JIS |
BS |
EN |
|
3Cr2W8V |
X30WCrV9-3 |
1.2581 |
H21 |
SKD6 |
|
|
2. 執(zhí)行標準 Standard GB/T1299-2014
3. 尺寸、外形、允許偏差 Size , shape ,tolerance
|
狀態(tài) condition |
公差 tolerance |
|
磨皮 grinding surface |
-0/+5mm |
|
車削 machined surface |
-0/+3mm |
|
自由長度 free length |
4-6m |
|
定尺長度 fixed length |
-0/+50mm |
|
超長 over long |
7-23m |
|
彎曲度 straightness |
≦3mm/m, 總彎曲度total straightness length ≦ total length總長度0.5% |
|
不圓度 ovality |
不大于公稱直徑公差的0.7倍 Not greater than 0.7 times the nominal diameter tolerance |
|
鍛材生產(chǎn)直徑范圍forged bar dia range |
140-600mm |
4. 冶煉方法 smelting process
電弧爐+爐外精煉+真空脫氣冶煉，下注鋼錠，電渣重熔需在合同中注明 EAF+LF+VD bottom pour ingot, ESR need indicate in contract
5. 交貨狀態(tài) delivery condition
退火磨氧化皮、車光、正火、調(diào)質(zhì)，交貨狀態(tài)需合同注明 annealed grinding surface. If need machining, normalizing or Q&T need
indicate in contract
6. 化學成份 chemical composition
|
Grade |
C |
Si |
Mn |
P |
S |
Cr |
W |
V |
|
H21/T20821 |
0.26~0.36 |
0.15~0.50 |
0.15~0.40 |
0.030 Max |
0.030≤ |
3.00~3.75 |
8.50~10.0 |
0.30~0.60 |
|
1.2581/ X30WCrV9-3 |
0.25~0.35 |
0.15~0.30 |
0.20~0.40 |
0.035 Max |
0.035 ≤ |
2.50~2.80 |
8.00~9.00 |
0.30~0.40 |
|
3Cr2W8V |
0.30~0.40 |
≤0.40 |
≤0.40 |
0.030 Max |
0.030 ≤ |
2.20~2.70 |
7.50~9.00 |
0.20~0.50 |
|
SKD5 |
0.25~0.35 |
0.10~0.40 |
0.15~0.45 |
0.030 Max |
0.020 ≤ |
2.50~3.20 |
8.50~9.50 |
0.30~0.50 |
其他元素檢測需要合同注明 other elements test result need indicate in contract.
7. 交貨硬度 hardness
|
牌號grade |
退火狀態(tài)交貨硬度 annealing condition hardness HBW ≦ |
試樣淬火硬度test specimen hardness after Q&T |
|
淬火溫度Q&T ℃ |
冷卻劑cooling agent |
洛氏硬度HRC ≧ |
|
3Cr2W8V |
255 |
1075-1125 |
油 oil |
|
8. 低倍組織 酸浸低倍試片上不得有目視可見的縮孔、夾雜、分層、裂紋、氣泡和白點。Macrostructure No visible shrinkage, inclusion, delamination, cracks,
bubbles or white spots should be observed on the acid – soaked sample piece
|
鋼材直徑diameter mm |
1組 group |
2組 group |
|
中心疏松 center porosity |
錠型偏析segregation |
中心疏松center porosity |
錠型偏析segregation |
|
級，不大于 class ≦ |
|
≦80 |
2.0 |
2.0 |
3.0 |
3.0 |
|
>80-150 |
2.5 |
3.0 |
3.5 |
3.0 |
|
>150-250 |
3.0 |
3.0 |
4.0 |
4.0 |
|
>250-400 |
3.5 |
3.0 |
4.5 |
4.0 |
|
>400 |
協(xié)商 Negotiate |
電渣鋼合格級別供需雙方協(xié)議 ESR steel qualified level need negotiate.
9. 顯微組織 microstructure
1) 珠光體組織 合格級別1-5級，熱壓力加工用鋼不檢測 pearlite 1-5 class
2) 網(wǎng)狀碳化物 直徑不大于60MM合格級別不大于3級 carbide network ≦ 3 class
3) 共晶碳化物不均勻度（冷作模具鋼檢測）Eutectic carbide inhomogeneity
|
鋼材直徑diameter MM |
共晶碳化物不均勻度合格級別Eutectic carbide inhomogeneity qualified level |
|
1組group |
2組 group |
|
級，不大于 class ≦ |
|
>120-400 |
6 |
協(xié)議Negotiate |
|
>400 |
協(xié)議Negotiate |
協(xié)議Negotiate |
10. 非金屬夾雜物 nonmetallic inclusion
電渣鋼結(jié)果符合1組，真空脫氣鋼符合2組 ESR steel conform to 1 group , VD steel conform to 2 group
|
非金屬夾雜物類別nonmetallic inclusion type |
1組 group |
2組 group |
|
細系thin series |
粗系heavy series |
細系thin series |
粗系heavy series |
|
級，不大于 class ≦ |
|
A |
1.5 |
1.5 |
2.5 |
2.0 |
|
B |
1.5 |
1.5 |
2.5 |
2.0 |
|
C |
1.0 |
1.0 |
1.5 |
1.5 |
|
D |
2.0 |
1.5 |
2.5 |
2.0 |
11. 脫碳層 decarburized layer
脫碳層深度不大于0.25+1%D,直徑大于150mm雙方協(xié)議 decarburized layer depth not greater than 0.25+1%D, diameter over 150mm negotiate.
12. 超聲檢測 UT test
執(zhí)行標準GB/T6402-2008,常規(guī)規(guī)格執(zhí)行D/d級，直徑400以上雙方協(xié)議，鋼材內(nèi)部不允許有白點、夾渣、分層、內(nèi)裂、縮孔等冶金缺陷 standard as per
GB/T6402-2008 /SEP1921 C/c or D/d class. No white spot, slag inclusion, delamination, cracking, shrinkage and other metallurgical defects are
allowed inside the steel
|
缺陷尺寸級別 defect size level |
單個缺陷平底孔直徑single FBH mm |
連續(xù)缺陷平底孔直徑continuous FBH mm |
連續(xù)缺陷最大長度continuous FBH length mm |
|
C |
7 |
5 |
40 |
|
D |
5 |
3 |
30 |
|
E |
3 |
2 |
30 |
|
缺陷數(shù)量級別defect qty level |
單個缺陷數(shù)量single FBH QTY |
連續(xù)缺陷數(shù)量continuous FBH QTY |
|
個數(shù)，不大于 number ≯ |
|
c |
8 |
4 |
|
d |
4 |
2 |
|
e |
2 |
1 |
13. 表面質(zhì)量 surface quality
鍛材表面沒有目視可見的裂紋、折疊、結(jié)疤和夾雜，如有上述缺陷就清除，深度不大于截面尺寸4%，清除寬度不小于深度的5倍，There are no visible
cracks, folds, scars or inclusions on the surface. If there are any of the above defects, they should be removed with a depth not greater than
4% of the section size and a width not less than 5 times of the depth.
14. 特殊要求 special requirements
超出標準約定范圍的供需雙方協(xié)議 The buyer and the seller negotiate beyond the agreed scope of the standard
15. 起訂量/交貨期30天 MOQ 20 tons 30 days delivery time.
16. 特點及用途 features and applications: 具有很高的韌性和良好的導熱性，鋼中較高的含鎢量，使鋼的回火穩(wěn)定性提高，并在回火過程中析出碳化
物造成二次硬化，因此3Cr2W8V鋼的紅硬性也較好。（650℃時硬度仍達HB300左右）適用于制作高溫下，高應(yīng)力，但不受沖擊負荷的高硬度的熱壓模，
頂鍛模,壓鑄模等。 It has high toughness, good thermal conductivity and high tungsten content in the steel, which improves the tempering stability
of the steel and causes secondary hardening due to carbide precipitation in the tempering process. Therefore, the red hardness of 3Cr2W8V steel is
also better.(The hardness is still up to ABOUT HB300 at 650℃) Suitable for the production of high temperature, high stress, but not under impact load
of high hardness hot pressing die, top forging die, die casting die, etc.
優(yōu)勢 advantage
煉鋼采用氣體保護澆注，快鍛機開坯，徑鍛機成材退火，鍛造頻率高恒溫鍛造有利于消除沿晶界分布的網(wǎng)狀碳化物。Pouring by gas protected , blooming
by fast forging machine, forming by radial forging machine and annealing, forging with high frequency and constant temperature is helpful to eliminate the
reticulated carbides distributed along the grain boundary.
