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Steel Grade: AISI A4| UNS: T30104

CHEMICAL COMPOSITION(AISI A4):  C(％) :        1.00 Si(％) :        0.20～0.40 Mn(％) :        2.00 Cr(％) :        1.00 Mo(％) :        1.00 V(％) :        — W(％) :        — Other(％) :        —

HARDNESS AND HEAT TREATMENT (AISI A4): Initial Forging Temperature/℃:        1010～1090 Finish Forging Temperature/℃:        900 Annealing/℃:        740～760 Hardbess HBS|After Annealing :        200～241 Quenching/℃:        820～870 Quenching Medium :        Air Tempering/℃:        150～430 Hardbess HBC|After Tempering :        62～54

Remark(AISI A4): 
①, The temperature is after carburization.
②, It is surface hardness after carburization.
③, Aging treatment.
Please find the PDF for AISI A4  

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Introduction Alloy Tool Steel (AISI A4)
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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ASTM D2, X155CrMoV12-1, ASTM D3, AISI H11, AISI H13,  AISI A4