s7 steel for sale- Aobo steel-a personal tool steel supplier

Get Superior S7 Material from Aobo Steel at Competitive Prices

S7 steel is an American ASTM standard S7 heavy-duty and medium-carbon alloy tool steel. Its high chromium content offers good tempering resistance and resistance to high-temperature oxidation.

Aobo Steel is a professional supplier, providing over 20 types of steel in the tool steel product sector. We are not just a material supplier but also a service supplier.. Our top-quality technology and customer service enable small and medium-sized factories worldwide to conveniently obtain reliable quality material at the best price.

Additional information: When looking for an S7 material equivalent, 1.2355 is often considered a close match.

Application Scenarios

Cold Work Tools: Includes shear blades, punches, chisels, swaging dies, and gripper dies, all needing high impact resistance.
Molding Applications: Used in plastic injection molds and inserts, ensuring precision and durability.
Die Casting: Suitable for aluminum and zinc casting dies, offering good thermal fatigue resistance.
Hot Work Tools: Applied in environments up to 1000°F, such as forging dies and aerospace components.

Why choose Aobo Steel as your supplier

We offer over 100 types of steel, including tool steel, alloy steel, stainless steel, alloy structural steel, and carbon steel.

We provide free cutting services.

With over 40 processing suppliers surrounding us, we have the capacity to deliver more than 2,000 tons of steel per month.

S7 steel properties

What is S7 steel? Here we understand it from data, including composition, properties, heat treatment, etc.

S7 steel composition

Element	Carbon (C)	Manganese (Mn)	Silicon (Si)	Chromium (Cr)	Molybdenum (Mo)
Content (%)	0.45-0.55	0.20-0.80	0.20-1.00	3.00-3.50	1.30-1.80

S7 tool steel property

Property	Value
Hardness (after heat treatment)	55-60 HRC
Tensile Strength (UTS)	670-2030 MPa (97-290 x 10^3 psi)
Elastic Modulus	190 GPa (28 x 10^6 psi)
Poisson’s Ratio	0.29
Shear Modulus	74 GPa (11 x 10^6 psi)
Impact Strength (Charpy V-notch)	10-12.5 ft-lb (13.6-16.9 J at various temperatures)

S7 steel heat treatment

Annealing Specification: For the best softening effect, the annealing temperature is 810–830°C, and the cooling rate is 15–30°C/h.
Quenching and Tempering Specification: The quenching temperature is 850–880°C, and the tempering temperature is 550°C. S7 tool steel hardness is typically Rockwell C 45 to 58 after tempering.

The benefits

Exceptional Shock Resistance and Impact Toughness

Air-Hardening Capability with Minimal Distortion

Easy Machinability in Annealed Condition

Good Dimensional Stability

Adequate Wear Resistance

Resistance to Thermal Fatigue in Hot Work Conditions

S7 steel vs 4140

Following is a comparison of S7 Steel Vs 4140 Steel in terms of categories, properties, and applications:

Categories:
S7 Steel is a shock-resistant tool steel known for being ideal for tools that experience high impact. On the other hand, 4140 Steel is a chromium-molybdenum alloy steel and caters as structural steel- suitable for mechanical performance.
Key Properties:
S7 Steel offers high shock resistance, excellent grind ability, and good stability in heat treatment, making it ideal for tools that need to withstand sudden forces and maintain precision. On the other hand, 4140 Steel is known for its high hardenability, good strength-to-toughness ratio, and suitability for surface hardening, which enhances its wear resistance—properties critical for structural durability.
Applications:
S7 Steel is used for tooling applications like punches, blanking dies, gripper dies, cold forming dies, and shears, where impact resistance is essential. Due to its comparably low Mo content, 4140 Steel finds applications in structural components, including crankshafts, gears, and pressure piping, which require good strength, toughness, and wear resistance property profiles.

To summarize the actual exploitable characteristics: S7 Steel is excellent at machining shock-resistant tooling due to its impact resistance and grindability, while 4140 Steel is designed more for structural applications, taking advantage of its strength, toughness, and hardenability.

Take the Next Step Toward Better Performance

Don’t wait for another material failure to halt your progress. S7 steel offers the strength, reliability, and versatility your manufacturing projects demand.

The AISI S7 Equivalent: DIN 1.2355

In the German steel standard, S7 steel is equivalent to DIN 1.2355. They have similar chemical compositions and mechanical properties, and can be substituted for each other.

1.2355 steel Chemical composition

Carbon (C)	Chromium (Cr)	Molybdenum (Mo)	Vanadium (V)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulfur (S)
0.45 – 0.55	3.00 – 3.50	1.30 – 1.70	0.15 – 0.35	0.50 – 0.90	0.20 – 0.80	max 0.030	max 0.020

1.2355 tool steel Physical Property

Physical Property	Value	Units	Notes
Density	7.76	g/cm³	Approximate value.
Coefficient of Thermal Expansion (CTE)	12.6	μm/m·K (20-200 °C)	Varies with temperature.
Coefficient of Thermal Expansion (CTE)	13.3	μm/m·K (20-425 °C)	Varies with temperature.
Coefficient of Thermal Expansion (CTE)	13.7	μm/m·K (20-500 °C)	Varies with temperature.
Modulus of Elasticity	207	GPa	Approximate value.