AISI D7 Tool Steel

Categories	Tool Steel Bars
Trademark/Brand	fushun
Model	D7
Process	hot rolled or hot forged
Delivery Condtion	annealed
Surface Condition	smooth, bright
FOB port	Shanghai
Terms of Payment	L/C, T/T
Update Time	Oct 30,2025

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Detail Information

AISI D7 Tool Steel

D7 tool steel is a high-carbon, high-chromium air-hardening tool steel that exhibits exceptional wear resistance. The high carbon and vanadium contents result in numerous, hard vanadium carbide particles in the steel. These carbides exhibit a hardness that is equivalent to approximately 80 to 85 Rockwell C.

The following are the list of applications of D7 tool steels:

l Brick mold liners

l Powder compaction tooling

l Shot blasting equipment liners

l Flattening rolls

l Powder compaction tooling

l Tools for ceramic extrusion and molding.

Designations:

ASTM A681-US
FED QQ-T-570-US
SAE J437-US
SAE J438-US
UNS T30407-US
AISI D7 Tool Steel-US

Chemical composition(mass fraction)(wt.%) of the D7

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Mo(％)	V(%)
2.15～2.50	0.10～0.60	0.10～0.60	≤0.030	≤0.030	11.5～13.5	0.70～1.20	3.80～4.40

MECHANICAL PROPERTIES

Yield Rp0.2 (MPa)	Tensile Rm (MPa)	Impact KV/Ku (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
984 (≥)	682 (≥)	41	31	23	Solution and Aging, Annealing, Ausaging, Q+T,etc	322

Forging/Rolling:

Preheat to 1500° F and soak thoroughly. Then raise to 2050° F - 2125° F. Do not forge or roll below 1800° F, cool slowly from the forging or rolling temperature. Do not normalize.

Annealing:

Heat slowly to 1600° F - 1650° F, and hold for uniformity, furnace cool at a rate of 20° F per hour to 1000° F then air cool. Expect Brinell hardness 235 - 262.

Hardening:

Preheat to 1500° F and soak until uniformly heated and either transfer or raise furnace temperature to 1850° F - 1950° F, and hold 1 hour per inch of greatest thickness. Cool in still air.

Tempering:

Temper immediately after quenching, before part has cooled to below 150° F. Parts should be held a minimum of 2 hours per inch of greatest thickness. Double tempering is recommended. For maximum wear resistance temper at 300° F. The above tempering table may be used as a guide. However, since 1/2" dia. specimens were used for this test, it may be found that heavier sections are several points lower.