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Appendix 5: Tool Steels Tensile Strength versus Brinell Hardness

By Edmund Isakov
From Cutting Data for Turning of Steel

Tables 5.1A and 5.1B. AISI type W1 (UNS T72301) water-hardening steel

Tables 5.2A and 5.2B. AISI type S1 (UNS T41901) shock-resisting steel

Tables 5.3A and 5.3B. AISI type S2 (UNS T41902) shock-resisting steel

Tables 5.4A and 5.4B. AISI type S5 (UNS T41905) shock-resisting steel

Tables 5.5A and 5.5B. AISI type S7 (UNS T41907) shock-resisting steel

Tables 5.6A and 5.6B. AISI type O1 (UNS T31501) oil-hardening cold-work steel

Tables 5.7A and 5.7B. AISI type O2 (UNS T31502) oil-hardening cold-work steel

Tables 5.8A and 5.8B. AISI type O7 (UNS T31507) oil-hardening cold-work steel

Tables 5.9A and 5.9B. AISI type A2 (UNS T30102) air-hardening cold-work steel

Tables 5.10A and 5.10B. AISI type A6 (UNS T30106) air-hardening cold-work steel

Tables 5.11A and 5.11B. AISI type P6 (UNS T51606) mold steel

Tables 5.12A and 5.12B. AISI type P20 (UNS T51620) mold steel

Tables 5.13A and 5.13B. AISI type L2 (UNS T61202) low-alloy special-purpose steel

Tables 5.14A and 5.14B. AISI type L6 (UNS T61206) low-alloy special-purpose steel

Tables 5.15A and 5.15B. AISI types H11 (UNS T20811) and H13 (T20813) hot-work steel

Tables 5.16A and 5.16B. AISI type H12 (UNS T20812) hot-work steel

Tables 5.17A and 5.17B. AISI type H21 (UNS T20821) hot-work steel

Tensile strength of AISI Type W1 (UNS T72301) water-hardening steel versus Brinell hardness (3000-kgf applied load)

Table 5.1A: Linear regression formula for calculating tensile strength: ? = 379 HB + 47330

Brinell hardness HB [*]

Tensile strength, psi

Accuracy in calculating ? %

HB x ?

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