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Steel Grade: AISI O7| UNS: T31507

CHEMICAL COMPOSITION(AISI O7):  C(％) :        1.20 Si(％) :        0.20～0.40 Mn(％) :        0.20～0.40 Cr(％) :        — Mo(％) :        — V(％) :        — W(％) :        — Other(％) :        —

HARDNESS AND HEAT TREATMENT (AISI O7): Initial Forging Temperature/℃:        980～1090 Finish Forging Temperature/℃:        870 Annealing/℃:        790～820 Hardbess HBS|After Annealing :        192～217 Quenching/℃:        790～830 Quenching Medium :        Water Tempering/℃:        160～290 Hardbess HBC|After Tempering :        64～58

Remark(AISI O7): 
①, The temperature is after carburization.
②, It is surface hardness after carburization.
③, Aging treatment.
Please find the PDF for AISI O7  

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Introduction Alloy Tool Steel (AISI O7)
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 O7