Smooth Round Bar High Performance Tool Steel From China 6-400mm

• Customization: Available
• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Model NO.: round bar
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Die Steel Bar
• Transport Package: Wooden
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7214100000

Product Description

H11 Tool Steel/1.2343/SKD6
H11 Tool Steel is a
premium, deep-hardening, air-hardening steel known for its exceptional thermal stability. It undergoes minimal dimensional changes during heat treatment. With lower vanadium content compared to the widely-used H13 tool steel, H11 boasts excellent toughness and outstanding thermal strength. It also offers impressive thermal fatigue resistance and moderate wear resistance at medium temperatures. Thanks to its air-quenching property at low austenitizing temperatures, H11 experiences minimal deformation and reduced iron oxide formation. Moreover, it can withstand erosion from molten aluminum.
1. Size Range for H11 Tool Steel
H11 Steel Round Bar: Diameter 80mm~420mm
H11 Steel Plate: Thickness 25mm~400mm x Width 200mm~800mm
Delivery Condition:
Turned Round Bar, Milled Plate, Black, Customized per customer requirements.
Spheroidizing Annealing, ESR material.
2. H11 Tool Steel Equivalent Grades

Country	USA	German		Japan	China
Standard	ASTM A681	W-nr.	DIN	JISG4404	GB/T1299-2000
Grades	H11	1.2343	X38CrMoV51	SKD6	4Cr5MoSiV

3. H11 Tool Steel Chemical Composition

Grades	C%	Si%	Mn%	P%	S%	Cr%	Mo%	V%
H11	0.32~0.43	0.80~1.20	0.20~0.50	≤0.03	≤0.03	4.75~5.50	1.10~1.60	0.30~0.60
1.2343/X38CrMoV51	0.36~0.42	0.90~1.20	0.30~0.50	≤0.03	≤0.03	4.80~5.50	1.10~1.40	0.25~0.50
SKD6	0.35~0.42	0.80~1.20	≤0.50	≤0.030	≤0.020	4.50~5.50	1.00~1.50	0.30~0.50

4. H11 Tool Steel Physical Properties
The physical properties of H11 Tool Steel are detailed in the tables below. The density is 7.69g/cm³, and the specific heat at constant pressure (20
°C
) Cp is 459.8J/(kg·K).
Critical temperature of H11 Tool Steel

Critical point	Ac1	Ac3	Ar1	Ar3	Ms	Mf
Temp.(approximation)	1567°F (853°C)	1673°F (912°C)	1328°F (720°C)	1423°F (773°C)	590°F (310°C)	217°F (103°C)

Coefficient of linear thermal expansion

Temp./ °C	20~100	20~200	20~300	20~400	20~500	20~600	20~700
Coefficient/°C^-1(x10^-6)	10.0	10.9	11.4	12.2	12.8	13.3	13.6

Thermal conductivity of H11

Temp. /°C	100	200	300	400	500	600	700
λ/W•(m•K)^-1	25.9	27.6	28.4	28.0	27.6	26.7	25.9

Elastic modulus of H11

Temp. /°C	20	100	200	300	400	500
E/MPa	227000	221000	216000	208000	200000	192000

5. Forging of H11 Tool Steel

Items	Heating temperature	Starting forging temperature	Final forging temperature	Cooling
Ingot	2084~2156°F (1140~1180°C)	2012~2102°F (1100~1150°C)	≥1652°F (≥900°C)	Cooling in hole or sand
Billet	2048~2102°F (1120~1150°C)	958~2012°F (1070~1100°C)	1562~1652°F (850~900°C)	Cooling in hole or sand

6. Heat Treatment of H11 Tool Steel
Soft Annealing

Temperature	Cooling	Hardness
1382~1470°F (750~799°C)	Furnace 20°F per hour to 1200°F(649°C),then air cooling.	230HB Max

Stress Relieving

Temperature	Cooling	Hardness
1200°F(649°C) for 2 hours	Cool slowly to 930°F(499°C) in air	230HB Max

Hardening

Temperature	Cooling	Hardness
1850~1880°F(1010~1027°C) Hold at temperature for 30 minutes	Vacuum quench to 1000°F(538°C),then cool to below150°F(65°C)	54HRC Max Quenched

Tempering

Temp.	752°F (400°C)	932°F (500°C)	1022°F (550°C)	1112°F (600°C)	1202°F (650°C)	1292°F (700°C)
Hardness HRC	52	54	52	48	38	31

-Temperatures are approximate and based on two hours at temperature.
-Follow optimal heat treatment parameters to achieve the maximum potential mold life.
7. Applications of H11 Tool Steel
H11 tool steel is ideal for hot tooling applications demanding maximum crack resistance. These include hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling. Chromium hot-work steels like H11 can be water-cooled without damage, thanks to their low carbon and alloy contents. Additionally, H11's medium thermal strength makes it suitable for structural components in aircraft and rockets, operating at temperatures between 752~932°F(400~500°C).