1. 牌号 Grade 4Cr5MoSiV | JIS SKD6 | DIN 1.2343 | BS BH11 | ASTM H11

GB	DIN	W-Nr.	AISI	JIS	BS	EN
4Cr5MoSiV		1.2343	H11	SKD6

2. 执行标准 Standard GB/T1299-2014
3. 尺寸、外形、允许偏差 Size , shape ,tolerance

状态 condition	公差 tolerance
磨皮 grinding surface	-0/+5mm
车削 machined surface	-0/+3mm
自由长度 free length	4-6m
定尺长度 fixed length	-0/+50mm
超长 over long	7-23m
弯曲度 straightness	≦3mm/m, 总弯曲度total straightness length ≦ total length总长度0.5%
不圆度 ovality	不大于公称直径公差的0.7倍 Not greater than 0.7 times the nominal diameter tolerance
锻材生产直径范围forged bar dia range	140-600mm

4. 冶炼方法 smelting process

电弧炉+炉外精炼+真空脱气冶炼，下注钢锭，电渣重熔需在合同中注明 EAF+LF+VD bottom pour ingot, ESR need indicate in contract

5. 交货状态 delivery condition

退火磨氧化皮、车光、正火、调质，交货状态需合同注明 annealed grinding surface. If need machining, normalizing or Q&T need
indicate in contract

6. 化学成份 chemical composition

Grade	C		Mn		P	S	Si		Cr		V		Mo
H11/T20811	0.35	0.45	0.20	0.60	0.03	0.03	0.80	1.25	4.75	5.50	0.30	0.60	1.10	1.60
1.2343/ X37CrMoV5-1	0.28	0.35	0.10	0.40	…	…	0.80	1.20	2.70	3.20	0.40	0.70	1.10	1.50
SKD6	0.32	0.42	…	0.50	0.03	0.03	0.80	1.20	4.50	5.50	0.30	0.50	1.00	1.50
BH11	0.32	0.40	…	0.40	0.35	0.35	0.85	1.15	4.75	5.25	0.30	0.50	1.25	1.75
4Cr5MoSiV	0.33	0.43	0.2	0.5	0.02	0.02	0.8	1.2	4.75	5.5	0.3	0.6	1.1	1.6

其他元素检测需要合同注明 other elements test result need indicate in contract.

7. 交货硬度 hardness

牌号grade	退火状态交货硬度 annealing condition hardness HBW ≦	试样淬火硬度test specimen hardness after Q&T
		淬火温度Q&T ℃	冷却剂cooling agent	洛氏硬度HRC ≧
H11	229	790±15℃ preheat 1020±6℃ heating, keep 5-15”,oil cooling ,550±6℃ tempering 2 hour

8. 低倍组织 酸浸低倍试片上不得有目视可见的缩孔、夹杂、分层、裂纹、气泡和白点。Macrostructure No visible shrinkage, inclusion, delamination,
8. cracks, bubbles or white spots should be observed on the acid – soaked sample piece 

钢材直径diameter mm	1组 group		2组 group
	中心疏松 center porosity	锭型偏析segregation	中心疏松center porosity	锭型偏析segregation
	级，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	协商 Negotiate

电渣钢合格级别供需双方协议 ESR steel qualified level need negotiate.

9. 显微组织 microstructure

1. 珠光体组织 合格级别1-5级，热压力加工用钢不检测 pearlite 1-5 class
2. 网状碳化物 直径不大于60MM合格级别不大于3级 carbide network ≦ 3 class
3. 共晶碳化物不均匀度（冷作模具钢检测）Eutectic carbide inhomogeneity

钢材直径diameter MM	共晶碳化物不均匀度合格级别Eutectic carbide inhomogeneity qualified level
	1组group	2组 group
	级，不大于 class ≦
>120-400	6	协议Negotiate
>400	协议Negotiate	协议Negotiate

10. 非金属夹杂物 nonmetallic inclusion

电渣钢结果符合1组，真空脱气钢符合2组 ESR steel conform to 1 group , VD steel conform to 2 group

非金属夹杂物类别nonmetallic inclusion type	1组 group		2组 group
	细系thin series	粗系heavy series	细系thin series	粗系heavy series
	级，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. 脱碳层 decarburized layer

脱碳层深度不大于0.25+1%D,直径大于150mm双方协议 decarburized layer depth not greater than 0.25+1%D, diameter over 150mm negotiate.

12. 超声检测 UT test

执行标准GB/T6402-2008,常规规格执行D/d级，直径400以上双方协议，钢材内部不允许有白点、夹渣、分层、内裂、缩孔等冶金缺陷 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

缺陷尺寸级别 defect size level	单个缺陷平底孔直径single FBH mm	连续缺陷平底孔直径continuous FBH mm	连续缺陷最大长度continuous FBH length mm
C	7	5	40
D	5	3	30
E	3	2	30

 

缺陷数量级别defect qty level	单个缺陷数量single FBH QTY	连续缺陷数量continuous FBH QTY
	个数，不大于 number ≯
c	8	4
d	4	2
e	2	1

13. 表面质量 surface quality

锻材表面没有目视可见的裂纹、折叠、结疤和夹杂，如有上述缺陷就清除，深度不大于截面尺寸4%，清除宽度不小于深度的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

超出标准约定范围的供需双方协议 The buyer and the seller negotiate beyond the agreed scope of the standard

15. 起订量 常规生产牌号交货期30天 MOQ :the grade regular MOQ 10tons , No stock book order 30 days delivery time.
16. 特点及用途  features and applications: 是一种含5%铬的热加工工具钢，具有优异的冲击韧性。根据美国钢铁协会的分类系统，
16. 铬热工工具钢被指定为H组钢，并在ASTM a681标准中指定。最常用的铬热加工钢是H11工具钢，h12工具钢和H13钢，在H1到H19的系列。H11
16. 工具钢是一种深硬化、空气硬化钢，H11合金钢可通过热处理和空气淬火进行深硬化。这使得在热处理过程中最小的尺寸变化。也有超抗热疲劳裂
16. 纹和卓越的抗粗裂纹和热冲击在水冷时。AISI H11 tool steel is a 5% chromium hot work tool steel that is represented by its excellent impact toughness.
16. Chromium hot-work tool steels are designated as group H steels according to the AISI classification system, and specified in ASTM A681standard.
16. The most commonly used chromium hot-work steels are H11 tool steel, h12 tool steel, and H13 steel, within the series from H1 to H19. H11 tool steel
16. is a deep-hardening, air-hardening steel and H11 alloy steel could be deep hardened by heat treatment and air-quenching. That gives minimal size
16. change during heat treatment. H11 hot work steel also has super resistance to thermal fatigue cracking and superb resistance to gross cracking and
16. thermal shock when water cooled in service.

优势 advantage
工艺成熟，炼钢采用气体保护浇注，快锻机开坯，径锻机成材并球化退火，锻造频率高恒温锻造有利于消除沿晶界分布的网状碳化物.在1000℃余温水淬超细化处
理，组织到AS3.用户要求化学成份C, Mo, V P＜0.020 S＜0.010 O≦2.0 H≦2.0ppm及组织级别都可以控制.圆棒长度可达25米，圆饼直径可达1.2米，锻管外径可达
650mm.Pouring by gas protected , blooming by fast forging machine, forming by radial forging machine and spheroidize annealing, forging with high frequency
and constant temperature is helpful to eliminate the reticulated carbides distributed along the grain boundary. We all do superfine treatment at 1000℃ lingering
warmth, structure ≦3 class. If customer need control chemical composition , gas or impact also can do , P＜0.020 S＜0.010 O≦2.0 H≦2.0ppm. Round
bar length up to 25m, discs diameter up to 1.2m, forged tube diameter up to 650mm.