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ASTM T4

2018-04-26 20:03:13
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Steel Grade: ASTM T4| UNS: T12004

CHEMICAL COMPOSITION(AISI S1): 
C(%) :         0.70~0.80
Si(%) :         0.20~0.40
Mn(%) :        0.10~0.40
P(%)≤ :        0.03
S(%)≤② :        0.03
Cr(%) :         3.75~4.50
Mo(%) :         0.40~1.00
V(%) :         0.80~1.20
W(%) :        17.5~19.0
Co(%):         4.25~5.75
HARDNESS AND HEAT TREATMENT (ASTM T4):
Hardness HBS|Annealing:        269
Hardness HBS|Cold Drawing:        285
Hardness HBS|Annealing after Cold Drawing:        277
Preheating Temperature/℃:        816~871
Quenching/℃|Salt-Bath Furnace:        1277
Quenching/℃|Controlled Atmosphere Furnace:        1288
Tempering/℃:        552
Hardness≥HRC|After Tempering:        63
Remark(ASTM T4): 
①, ω(Cu+Ni)≤0.75%
②, The composition of S can be increased to ω(S)0.06%~0.15% in order to improve the performance of cutting.
③, The standard is ASTM A600-1999.
Please find the PDF for ASTM T4  
Introduction High Speed Tool Steel (ASTM T4)
High speed tool steel is mainly used in manufacturing high efficient cutting tool.Due to its high red hardness, good abrasion resistance, high strength characteristics, and also used in the manufacture of high performance requirements of the mould, and hot spring roll, high temperature bearing, etc.The use of high speed tool steel after heat treatment the hardness can reach more than HRC63, under the working temperature of 600 ℃ can still maintain a high hardness, but its toughness, wear resistance and heat resistance are good.Annealing state of high speed tool steel main alloy elements tungsten, molybdenum, chromium, vanadium, and some joined the cobalt in high speed tool steel, aluminum and other elements.


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