Carbon Bearing Steel

Name: China Carbon Bearing Steel Manufacturers Suppliers - Carbon Bearing Steel Made in China
Brand: Promisteel
SKU: 293662606

NAME: Carbon Bearing Steel / Economy Bearing Steel
BRAND: PROMISTEEL
GRADES: C55, 55#, S55C, AISI 1055, G55
SHAPES: Round Bar, Wire Rod, Tube
DELIVERY CONDITION: Hot Rolled, Annealed, Cold Drawn
HARDNESS: Surface Hardened (Induction) to 50-56 HRC
FEATURE: Cost-Effective, Good Machinability
APPLICATION: Conveyor Rollers, Drawer Slides, Casters, Bicycle Parts
MOQ: 25 Tons

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Product Introduction

Carbon Bearing Steel is the cost-effective alternative to high-grade Chrome Bearing Steel (GCr15). Designed for low-speed, light-load applications, this steel type offers substantial cost savings while maintaining sufficient hardness and wear resistance for non-critical bearing components.

Our primary grade, S55C / C55 (AISI 1055), features a carbon content of approximately 0.55%. Unlike through-hardening chrome steels, Carbon Bearing Steel is typically Surface Hardened (via Case Hardening or Induction Hardening) to create a wear-resistant outer shell while retaining a tough core. It is the material of choice for the furniture industry, light logistics equipment, and hardware sectors.

Product Specifications & Grade Equivalents

We supply Carbon Bearing Steel suitable for cold heading and machining.

Table-1

Standard grades for economy bearing applications.

International Grade Comparison
GB (China)	ASTM / AISI (USA)	DIN (Germany)	JIS (Japan)	Type
55#	1055	1.0535 (C55)	S55C	Standard Carbon Bearing Steel
G55	-	-	-	Dedicated Bearing Grade
60#	1060	1.0601 (C60)	S58C	Higher Hardness
GCr9	51100	-	SUJ1	Low Alloy (Transitional Grade)

Table-2

Simple C-Mn composition ensures low cost and easy processing.

Chemical Composition (Mass Fraction %)
Grade	C	Si	Mn	P	S
C55 / S55C	0.52~0.60	0.15~0.35	0.60~0.90	≤0.030	≤0.035
C60 / 1060	0.57~0.65	0.15~0.35	0.60~0.90	≤0.030	≤0.035

Table-3

Supplied in forms optimized for ball and roller production.

Supply Range & Formats
Product Form	Dimensions (mm)	Delivery Condition	Typical Use
Wire Rod	Dia: 5.5 - 20	Spheroidize Annealed / Pickled	Cold Heading Balls/Rollers
Round Bar	Dia: 20 - 150	Hot Rolled / Peeled	Machined Races/Shafts
Seamless Tube	OD: 20 - 100	Cold Drawn	Bearing Rings

Key Features and Advantages

Significant Cost Savings: Carbon Bearing Steel is significantly cheaper than GCr15 (52100) Chrome Steel because it lacks expensive alloying elements like Chromium.
Excellent Machinability: In the annealed state, C55/S55C is much easier to cut, turn, and drill than high-carbon chrome steels, reducing tooling costs and cycle times.
Surface Hardenability: Through Induction Hardening or Carburizing, the surface hardness can reach 50-56 HRC, providing adequate wear resistance for sliding contact.
Toughness: The lower carbon content ensures the core remains ductile, preventing brittle fracture under light shock loads.

Typical Applications

Carbon Bearing Steel is strictly for Non-Critical applications where precision and high speed are not required:

Conveyor Systems

Rollers and bearings for gravity conveyors and logistics belts.

Furniture Hardware

Drawer slides, door hinges, and office chair casters.

Bicycles & Toys

Headset bearings, pedal bearings, and wheel hubs for low-end bicycles.

Sliding Tracks

Guide wheels for sliding doors and windows.

Automotive

Seat adjustment mechanisms and wiper arm joints.

FAQ

Q1: What is the main difference between Carbon Bearing Steel and Chrome Bearing Steel (52100)?

A1: Performance & Price.
Chrome Steel (52100) is for high-speed, high-load, precision bearings (e.g., motors, engines). It lasts millions of cycles.
Carbon Steel (C55) is for low-speed, light-load bearings (e.g., drawers, casters). It is much cheaper but has a shorter fatigue life.

Q2: Can Carbon Bearing Steel rust?

A2: Yes. Like all carbon steels, it will rust if exposed to moisture. It requires grease or plating (zinc/chrome plating) for corrosion protection.

Q3: Is this steel suitable for electric motor bearings?

A3:
No. Electric motors run at high speeds (RPM > 1000) and generate heat. Carbon-bearing steel will fail rapidly. For motors, you must use GCr15 (52100) Chrome Steel.

Q4: Can you supply Spheroidize Annealed C55 wire?

A4: Yes. For customers producing steel balls via cold heading, we supply Spheroidize Annealed (SA) wire rod to ensure the material is soft enough to be formed without cracking.

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