AISI D7 Tool Steel

Categories	Tool Steel Bars
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	Apr 29,2024

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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.