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S7

S7 Product Guide

Applications | Specifications | Mechanical and Chemical Data | Tolerances

Overview

An oil or air hardened tool steel that exhibits excellent high impact toughness and strength. Typically used in shear blades, dies, chisels, and punches.

Common Trade Names

UNS T41907, AISI Type S7, Shock-Resisting Steel, Super-7

Other Resources

Weight Calculator | Mill Test Reports

Products

S7 Drill Rod | S7 Rectangle Bar

Specifications

ASTM	SAE
A681	J437

Applications

Blades
Tooling

Hardness	Heat Treat Temp.	Quench Medium	Applications	Advantages
S-7 Tool Steel Heat Treatment
As Shipped: Rockwell 90-97B After Heat Treating: Rockwell 55-57C	1725°-1750°F	Air or Oil	S7 is good for general tooling and molding applications. It possesses high toughness and shock resistance.	While S7 is very tough compared to other tool steels, it doesn't have hardness comparable to the other tool steels.

	Annealed	Hardened
Physical Properties S7
Density	0.283 lb/in3	0.283 lb/in3
Ultimate Tensile Strength	97 ksi	290 ksi
Yield Tensile Strength	53 ksi	N/A
Shear Modulus	11,000 ksi	11,000 ksi
Shear Strength	61 ksi	N/A
Hardness Rockwell \| Brinell	B90-97 \| 188-223	C55-57 \| 560-595
Elongation at Break Percentage	21%	N/A
Modulus of Elasticity	28,000 ksi	28,000 ksi
Poisson's Ratio	0.29	0.29
Machinability Percentage	95%	N/A
Melting Point	2,590-2,660 °F	2,590-2,660 °F
Specific Heat	1.1 x 10^-1 BTU/lb-°F	1.1 x 10^-1 BTU/lb-°F
Thermal Conductivity	276 BTU-in/hr-ft^2-°F	276 BTU-in/hr-ft^2-°F
Electrical Conductivity	7.8% IACS	7.8% IACS

Chemistry Information
Element	Percentage
Fe	93.85
C	0.5
Cr	3.25
Mo	1.4
Mn	0.75
Si	0.25