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Phone：+86 0537-3330928
Fax：+86 0537-3330928
Email ：info@darrenco.cn
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| 20Cr2Ni4/30NC14 |
1. 牌號 Grade20Cr2Ni4/30NC14
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GB |
DIN |
W-Nr. |
AISI |
JIS |
BS |
EN |
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20Cr2Ni4 |
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30NC14 |
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2. 執行標準 Standard GB/T3077-2015
3. 尺寸、外形、允許偏差 Size , shape ,tolerance
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狀態 condition |
公差 tolerance |
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磨皮 grinding surface |
-0/+5mm |
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車削 machined surface |
-0/+3mm |
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自由長度 free length |
4-6m |
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定尺長度 fixed length |
-0/+50mm |
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超長 over long |
7-23m |
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彎曲度 straightness |
≦3mm/m, 總彎曲度total straightness length ≦ total length總長度0.5% |
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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 |
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鍛材生產直徑范圍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 delivery condition
退火磨氧化皮、車光、正火、調質，交貨狀態需合同注明 annealed grinding surface. If need machining, normalizing or Q&T need indicate in contract
6. 化學成份 chemical composition
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牌號grade |
C |
Si |
Mn |
P≦ |
S≦ |
Cr |
Ni |
Mo |
V |
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20Cr2Ni4 |
0.17/0.23 |
0.17/0.37 |
0.30/0.60 |
0.025 |
0.025 |
1.25/1.65 |
3.25/3.65 |
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其他元素檢測需要合同注明 other elements test result need indicate in contract.
7. 力學性能,交貨硬度 mechanical property,hardness
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推薦的熱處理制度Recommended heat treatment regime |
力學性能mechanical property |
退火或回火交貨硬度annealed or tempered HBW |
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淬火quenching |
回火tempering |
抗拉強度 tensile MPa |
屈服強度yield MPa |
伸長率 elongation A% |
收縮率shrinkage Z% |
沖擊功impact J |
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加熱溫度℃ heating |
冷卻劑coolant |
加熱溫度℃ heating |
冷卻劑coolant |
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第1次淬火first time quenching |
第2次淬火 2rd quenching |
不小于 ≧ |
不大于 ≦ |
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880 |
780 |
油oil |
200 |
水、空氣 |
1180 |
1080 |
10 |
45 |
63 |
269 |
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
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鋼材直徑diameter mm |
1組 group |
2組 group |
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中心疏松 center porosity |
錠型偏析segregation |
中心疏松center porosity |
錠型偏析segregation |
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級，不大于 class ≦ |
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≦80 |
2.0 |
2.0 |
3.0 |
3.0 |
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>80-150 |
2.5 |
3.0 |
3.5 |
3.0 |
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>150-250 |
3.0 |
3.0 |
4.0 |
4.0 |
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>250-400 |
3.5 |
3.0 |
4.5 |
4.0 |
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>400 |
協商 Negotiate |
電渣鋼合格級別供需雙方協議 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
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鋼材直徑diameter MM |
共晶碳化物不均勻度合格級別Eutectic carbide inhomogeneity qualified level |
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1組group |
2組 group |
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級，不大于 class ≦ |
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>120-400 |
6 |
協議Negotiate |
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>400 |
協議Negotiate |
協議Negotiate |
10. 非金屬夾雜物 nonmetallic inclusion
電渣鋼結果符合1組，真空脫氣鋼符合2組 ESR steel conform to 1 group , VD steel conform to 2 group
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非金屬夾雜物類別nonmetallic inclusion type |
1組 group |
2組 group |
DS |
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細系thin series |
粗系heavy series |
細系thin series |
粗系heavy series |
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級，不大于 class ≦ |
≦ |
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A |
3.0 |
2.5 |
2.5 |
2.0 |
2 |
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B |
3.0 |
2.0 |
2.5 |
1.5 |
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C |
2.0 |
1.5 |
1.5 |
1.0 |
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D |
2.0 |
1.5 |
1.5 |
1.0 |
11. 脫碳層 decarburized layer
脫碳層深度不大于0.25+1%D,直徑大于150mm雙方協議 decarburized layer depth not greater than 0.25+1%D, diameter over 150mm negotiate.
12. 超聲檢測 UT test
執行標準GB/T6402-2008,常規規格執行D/d級，直徑400以上雙方協議，鋼材內部不允許有白點、夾渣、分層、內裂、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
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缺陷尺寸級別 defect size level |
單個缺陷平底孔直徑single FBH mm |
連續缺陷平底孔直徑continuous FBH mm |
連續缺陷最大長度continuous FBH length mm |
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C |
7 |
5 |
40 |
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D |
5 |
3 |
30 |
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E |
3 |
2 |
30 |
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缺陷數量級別defect qty level |
單個缺陷數量single FBH QTY |
連續缺陷數量continuous FBH QTY |
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個數，不大于 number ≯ |
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c |
8 |
4 |
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d |
4 |
2 |
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e |
2 |
1 |
13. 表面質量 surface quality
鍛材表面沒有目視可見的裂紋、折疊、結疤和夾雜，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議 The buyer and the seller negotiate beyond the agreed scope of the standard
15. 起訂量30噸以上，交貨期30天 MOQ 20-35 tons, 30 days delivery time.
16. 特點及用途 features and applications: 用作強度要求較高的滲碳及調質結構件 Used for carburizing and quenching structures with high strength
requirements
優勢 advantage
工藝成熟，煉鋼采用氣體保戶澆注，快鍛機開坯，徑鍛機成材，鍛造頻率高恒溫鍛造有利于得到較好鋼材內部組織。
The process is mature, pouring by gas protected, blooming by fast forging machine, forming by radial forging machine, forging with high frequency
and constant temperature is beneficial to get better steel internal organization. |
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