Choosing the right spring steel is important for product performance and service life. C100S Und 65Mn-Stahl are two common options, but many customers are not clear about their differences.

In this article, we will explain:

• What is C100S spring steel
• What is 65Mn spring steel
• C100S vs 65Mn: properties comparison
• Applications of C100S and 65Mn spring steel
• How to choose between C100S and 65Mn

1. What is C100S Spring Steel?

C100S steel is a high-carbon spring steel grade with excellent tensile strength, high elasticity, and superior fatigue resistance. It features stable performance under heavy load and long-term repeated stress, making it ideal for high-performance springs, automotive parts, clutch springs, and precision elastic components.

We supply C100S steel in strips, wires, flat bars, and customized sizes with strict quality control and competitive factory price.

2. What is 65Mn Spring Steel?

65Mn steel is a cost-effective manganese spring steel widely used in general industrial applications. It offers good elasticity, acceptable strength, great machinability, and easy processing. Suitable for medium-load springs, spring washers, circlips, agricultural machinery parts, and hardware components.

Our 65Mn steel provides stable quality, complete specifications, and fast delivery for global wholesale buyers.

Spring Steel C100S vs 65Mn – Chemical & Properties Comparison Table

Grad	C	Si	Mn	P	S	Cr
C100S	0,95–1,05%	0.15–0.35%	0,30–0,60%	≤0.025%	≤0.025%	≤0.40%
65 Mio.	0.62–0.70%	0.17–0.37%	0.90–1.20%	≤0.035%	≤0.035%	≤0.25%

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Mechanical & Physical Properties Comparison

Properties	C100S Stahl	65Mn Steel
Zugfestigkeit	≥2000 MPa	≥980 MPa
Streckgrenze	≥1700 MPa	≥785 MPa
Härte (HRC)	58–62	52–58
Fatigue Resistance	Very high	Gut
Toughness	Medium	Better
Bearbeitbarkeit	Medium	Gut
Wärmebehandlung	Strict control needed	Easy & stable
Typical Application	High-stress springs, auto parts	General springs, washers
Kosten	Higher	Lower & cost-effective

3. C100S vs 65Mn: Which is Better?

There is no universal answer to which material is better. C100S Und 65Mn-Stahl products are designed for different working conditions and requirements.

C100S is better for:

• High strength and high fatigue resistance
• Heavy-duty and long-life applications
• High-performance springs and precision parts

65Mn is better for:

• Cost-effective projects
• Easy processing and mass production
• General-purpose medium-load components

Our Products

• C100S Stahl High-strength for heavy-duty and high-performance applications.
• 65Mn Steel Cost-effective general-purpose steel for mass production.
• C100S vs 65Mn Full comparison of properties, hardness, applications and cost.

We support customized processing, strict quality control and fast worldwide shipping.