Tool Steel H21, T20821
2026-08-21 16:44:00 Origin： Remark：0 Click：
Technical specifications of ASTM standards A681 hot working alloy tool steel H21 datasheet, H21 Chemical compositions, H21 Mechanical properties
TECHNICAL DATA SHEET - H21 & T20821
Material category: hot work tool steel
Material specification: ASTM A681 -2004
Typical chemical compositions (mass weight - %)
Carbon, C (％): 0.30 ~ 0.40
Silicon, Si (％): 0.15~0.50
Manganese, Mn (％): 0.10 ~ 0.40
Phosphorus, P (％): ≤ 0.030
Sulfur, S (％): ≤ 0.030
Chromium, Cr (％): 3.00 ~ 3.75
Molybdenum, Mo (％): -
Tungsten, W (％): 8.75 ~ 10.0
Silicon, Si (％): 0.15~0.50
Manganese, Mn (％): 0.10 ~ 0.40
Phosphorus, P (％): ≤ 0.030
Sulfur, S (％): ≤ 0.030
Chromium, Cr (％): 3.00 ~ 3.75
Molybdenum, Mo (％): -
Tungsten, W (％): 8.75 ~ 10.0
Vanadium, V (%): 0.30 ~ 0.50
HEAT TREATMENT PRACTICE AND HARDNESS
Hot working tenperature ℃ /Starting: 1070~1180
Hot working tenperature ℃ /Ending: 900
Annealing temperature ℃: 870~900
Hardness after annealing ≤HBW: 207~235
Quenching temperature ℃: 1100~1200
Cooling medium: air/oil
Tempering temperature ℃: 590~680
Hardness value after tempered /HRC: 54~36
Annealing temperature ℃: 870~900
Hardness after annealing ≤HBW: 207~235
Quenching temperature ℃: 1100~1200
Cooling medium: air/oil
Tempering temperature ℃: 590~680
Hardness value after tempered /HRC: 54~36
MELTING PROCESS
This alloy is generally smelt in electric arc furnace (EAF ) or IFF + VD, LF + Electroslag remelting (ESR). For a purpose of higher quality, it should be smelt via technology of vacuum refining.
TYPICAL APPLICATIONS
Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion mould and measuring implements, and further to manufacture the piston, valve, valve seat of fuel pump of diesel engine.
Cutting tools
Mechanical parts
Air hammer tools
Piercing tools
Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion mould and measuring implements, and further to manufacture the piston, valve, valve seat of fuel pump of diesel engine.
Cutting tools
Mechanical parts
Air hammer tools
Piercing tools
FEATURES AND CLASSIFICATIONS
Hot-work die divides into several main types, such as hammer forging, die forging, extrusion and die casting, including hot forging die, press machine forging die, stamping die, hot-extrusion die, metal die-casting mould. Heat distortion mould not only supports huge mechanical stress, but also thermal stress during working repeatedly. Hot-work die steel should have not only high hardness, red hardness, abrasion resistance, toughness, but also have excellent high temperature strength, thermal fatigue stability, thermal conductivity, upper hardenability for guaranteeing the whole cross section with consistent mechanical property.
Hot-work die divides into several main types, such as hammer forging, die forging, extrusion and die casting, including hot forging die, press machine forging die, stamping die, hot-extrusion die, metal die-casting mould. Heat distortion mould not only supports huge mechanical stress, but also thermal stress during working repeatedly. Hot-work die steel should have not only high hardness, red hardness, abrasion resistance, toughness, but also have excellent high temperature strength, thermal fatigue stability, thermal conductivity, upper hardenability for guaranteeing the whole cross section with consistent mechanical property.
PRODUCT PROFILE
Round bar, rod, disc (diameter): 6.0 to 800 mm
Square bar, flat bar: 10 to 600 mm
Length: random length or based on the customer's special requirement.
Heavy, middle plate via hot rolled: T6 ~ 200 X W50 ~ 1500 X L1000 ~ 12000 mm
Forging piece: stepped shafts, and other different shapes based on OEM.
Round bar, rod, disc (diameter): 6.0 to 800 mm
Square bar, flat bar: 10 to 600 mm
Length: random length or based on the customer's special requirement.
Heavy, middle plate via hot rolled: T6 ~ 200 X W50 ~ 1500 X L1000 ~ 12000 mm
Forging piece: stepped shafts, and other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE & SERVICE
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