S35C Tool Steel

S35C is a medium carbon steel grade specified under JIS G 4051 Japanese standard for machine structural & light tool use. Its equivalent international grades include DIN C35 / AISI 1035 / GB 35# / ISO C35E4. The "35" represents its nominal 0.35% average carbon content, delivering a perfect balance of ductility and moderate strength, suitable for general tools, forged blanks and mechanical components that require cutting, forming and heat treatment adjustment.

Why S35C Over Low-Carbon & Higher Carbon Tool Grades?

 

One-stop steel procurement

Better load capacity – Higher strength than S25C/S30C without severe brittleness.

Lower processing cost – Easier cutting and forming than S45C/S50C, reduces machining loss.

Wide heat treatment window – Adjustable hardness range to match diverse light tool & structural demands.

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Full Mill Certification – Your Guarantee of Compliance

Every batch of S35C tool steel includes complete documentation complying with JIS G4051 standard, ensuring:

Full material traceability from steel mill to delivery.

Verified mechanical & chemical testing via independent third-party labs.

Original Mill Test Certificates (MTC) issued under EN 10204 Type 3.1 / 3.2.

Available inspection items: Tensile test, hardness test, Charpy impact test, spectroscopic composition analysis, ultrasonic flaw detection, magnetic particle inspection.

why choose us?

 

Large Stock Availability: We maintain over 3,000 tons of S35C round bar, plate and flat bar in standard sizes ready for immediate delivery.

Custom Processing Service: Free cutting, surface grinding, heat treatment outsourcing to save your secondary machining cost.

Global Logistics Support: Bulk sea shipment or container delivery to ports in Southeast Asia, Europe, Middle East and North America.

Direct Factory Price: Long-term cooperation with domestic top steel mills without intermediate markup.

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User Evaluation

We purchased S35C flat bars for fixture jig blanks, the material uniform hardness and perfect machining performance, no edge chipping during CNC milling, complete MTC documents, stable supply cycle.

Mr. Li Ming

Suzhou · Precision Mold Manufacturing Factory

We switched from low carbon steel to S35C for our bolt forging line, the forged parts have higher tensile strength after tempering, reduce product failure rate greatly.

Ms. Pham Mai Linh

Ho Chi Minh · Fastener Forging Plant Vietnam

We source S35C round bars for light-duty shaft production for two years, the surface quality is stable, tolerance meets drawing requirements, short lead time for customized sizes.

Mr. James Wilson

Melbourne · General Machinery Workshop Australia

FAQ

 

 

01.What standard does S35C follow?

S35C complies with JIS G 4051 Japanese standard for machine structural carbon steel, equivalent grades: DIN C35, AISI 1035, Chinese GB 35# steel. It is categorized as medium carbon light tool steel for non-heavy load applications.

02.What is the difference between S35C and S45C tool steel?

S35C has lower carbon content (0.32–0.38%) than S45C, better ductility, easier machining & welding, suitable for light-load tools and general structural parts. S45C features higher hardness and wear resistance after quenching, applied to heavy-load shafts and precision tools.

03.What delivery states can we choose for S35C?

Available delivery conditions: Hot rolled (AR), Cold drawn (CD), Forged, Annealed (A), Normalized (N), Quenched & Tempered (QT). Specify required state in order, default as hot rolled black surface without heat treatment.

04.Can S35C be surface hardened?

Yes, flame hardening and induction surface hardening can be processed on S35C to obtain surface hardness up to HRC50, suitable for parts requiring wear-resistant surface and tough core.

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