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Steel Grade: AISI S7| UNS: T41907

CHEMICAL COMPOSITION(AISI S7):  C(％) :        0.50 Si(％) :        0.20～0.40 Mn(％) :        0.20～0.40 Cr(％) :        3.25 Mo(％) :        1.40 V(％) :        — W(％) :        — Other(％) :        —

HARDNESS AND HEAT TREATMENT (AISI S7): Initial Forging Temperature/℃:        — Finish Forging Temperature/℃:        — Annealing/℃:        815～845 Hardbess HBS|After Annealing :        187～223 Quenching/℃:        925～955 Quenching Medium :        Oil or Air Tempering/℃:        205～620 Hardbess HBC|After Tempering :        57～45

Remark(AISI S7): 
①, The temperature is after carburization.
②, It is surface hardness after carburization.
③, Aging treatment.
Please find the PDF for AISI S7  

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Introduction Alloy Tool Steel (AISI S7)
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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X5CrNiCuNbl6-4, 316Ti, 301A, 303, 304L, 310S, 316L, 317L, 321,
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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 S7