Smooth Trademark Round Bar Steel

• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: round bar
• 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
deep-hardening, air-hardening steel that exhibits minimal size change during heat treatment. It contains less vanadium than the widely-used H13 tool steel. This steel offers excellent toughness, impressive thermal strength, superior thermal fatigue properties, and moderate wear resistance at medium temperatures. When air-quenched at low austenitizing temperatures, it experiences minimal heat treatment deformation and low iron oxide formation, making it highly resistant to molten aluminum erosion.
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, tailored to 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
Physical properties of H11 Tool Steel are listed 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

-Tempering hardness is approximate and based on two hours at temperature.
-Optimal heat treatment parameters should be followed to achieve maximum potential mold life.
7. Applications of H11 Tool Steel
H11 tool steel is ideal for hot tooling applications where superior resistance to cracking is critical. These applications include hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling. Tools made from chromium hot-work steels can be safely water-cooled due to their low carbon and alloy contents. Additionally, H11’s medium thermal strength makes it suitable for structural parts in aircraft and rocket manufacturing, operating at temperatures of 752~932°F(400~500°C).