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AISI H21

2018-04-18 19:54:29
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Steel Grade: AISI H21| UNS: T20821

CHEMICAL COMPOSITION(AISI H21): 
C(%) :        0.30~0.40
Si(%) :        0.15~0.30
Mn(%) :        0.20~0.40
Cr(%) :        3.00~3.75
Mo(%) :        —
V(%) :        0.30~0.50
W(%) :        8.75~10.00
Other(%) :        —
HARDNESS AND HEAT TREATMENT (AISI H21):
Initial Forging Temperature/℃:        1070~1180
Finish Forging Temperature/℃:        900
Annealing/℃:        870~900
Hardbess HBS|After Annealing :        207~235
Quenching/℃:        1100~1200
Quenching Medium :        Air or Oil
Tempering/℃:        590~680
Hardbess HBC|After Tempering :        54~36
Remark(AISI H21): 
①, The temperature is after carburization.
②, It is surface hardness after carburization.
③, Aging treatment.
Please find the PDF for AISI H21  
Introduction Alloy Tool Steel (AISI H21)
Alloy tool steel, carbon tool steel with Si, Mn, Ni, Cr, Mo, V, W and other alloy elements in order to improve the hardenability and toughness, wear resistance and heat resistance of steel.Add Cr and Mn can improve the hardenability of tool steel, according to the requirements, selectively to join or add other elements (adding amount is generally not more than 5%), that is, to form a series of alloy tool steel.It is mainly used in the manufacture of measuring tools and cutters, shock resistant and cold and hot mould and some special purpose tools.


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616, 440B, 440C, 431, 430FR, 430F, 430, 422, 416, 410, 405,
ASTM D2, X155CrMoV12-1, ASTM D3, AISI H11, AISI H13,  AISI H21

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