Product Specification

ASTM A29 AISI 1020 Cold Drawn Carbon Steel Bar For CNC Machining Applications

Product Overview

Carbon Steel Bar is a high-performance steel product made from iron-carbon alloys with controlled carbon content and alloying elements. It is one of the most widely used engineering materials due to its excellent combination of strength, hardness, weldability, and machinability.

Syliath Carbon Steel Bar is manufactured using advanced hot rolling, forging, and cold drawing processes to meet different industrial requirements. The product is available in a wide range of grades, including Q235, Q345, 45#, S45C, C45, AISI 1020, AISI 1045, 42CrMo, 40Cr, 65Mn, and GCr15.

With a diameter range of 5mm-250mm and customizable lengths from 4000mm to 15000mm, our carbon steel bars are suitable for precision machining, structural engineering, automotive components, energy equipment, shipbuilding, and heavy industrial applications.

Syliath provides carbon steel bars according to international standards such as ASTM, AISI, JIS, DIN, EN, and GB, ensuring stable quality and reliable performance for global customers.

Cause

Why Carbon Steel Bar Is Widely Used?

Carbon steel is one of the most important basic materials in modern industries. The addition of carbon improves the mechanical properties of steel, making it stronger and harder compared with pure iron.

The main reasons for choosing carbon steel bars include:

1. Excellent Strength and Hardness

The carbon content increases the hardness and tensile strength of steel, making it suitable for heavy-load applications.

2. Good Machinability

Carbon steel bars can be easily processed through:

• Cutting
• Turning
• Welding
• Bending
• Forging
• CNC machining

3. Cost-Effective Material

Compared with alloy steel and stainless steel, carbon steel provides excellent performance at a competitive price.

4. Wide Grade Selection

Different carbon contents and alloy elements allow carbon steel bars to meet various requirements, from general construction to high-strength mechanical parts.

Solution

Customized Carbon Steel Bar Solutions for Industrial Requirements

Syliath provides complete carbon steel bar solutions according to different application requirements.

Material Solutions

We supply various steel grades:

• Carbon structural steel
• Low alloy high strength steel
• Medium carbon steel
• Alloy structural steel
• Spring steel
• Bearing steel
• Marine steel

Manufacturing Solutions

Available production methods:

Hot Rolled Carbon Steel Bar

• Suitable for general structural applications
• High production efficiency
• Good mechanical properties

Forged Carbon Steel Bar

• Improved internal structure
• Higher strength and impact resistance
• Suitable for heavy machinery parts

Cold Drawn Carbon Steel Bar

• High dimensional accuracy
• Better surface finish
• Suitable for precision components

Customized Services

Syliath can provide:

• Customized diameter
• Customized length
• Surface treatment
• Cutting service
• Heat treatment
• Mechanical testing
• Third-party inspection

Specifications

Available Grades

Application

Carbon steel bars are widely used in industries requiring high strength, durability, and reliable mechanical performance.

1. Mechanical Manufacturing

Used for:

• Machine shafts
• Gear components
• Bearings
• Rollers
• Hydraulic parts
• CNC machining parts

2. Automotive Industry

Applications include:

• Drive shafts
• Engine components
• Suspension parts
• Vehicle frames
• Fasteners

3. Construction Industry

Used in:

• Steel structures
• Bridges
• Building supports
• Engineering frameworks

4. Shipbuilding Industry

Carbon steel bars are applied in:

• Ship structures
• Marine equipment
• Anchor chains
• Heavy-duty components

5. Oil & Gas and Petrochemical Industry

Suitable for:

• Oil well equipment
• Pressure equipment
• Petrochemical machinery
• Industrial facilities

6. Precision Manufacturing

Used for:

• Tools
• Dies
• Molds
• Precision instruments

How It Works

Manufacturing Process of Carbon Steel Bar

1. Raw Material Preparation

High-quality steel billets are selected according to chemical composition requirements.

The main elements include:

• Carbon (C)
• Silicon (Si)
• Manganese (Mn)
• Phosphorus (P)
• Sulfur (S)

These elements determine the final strength and performance.

2. Hot Rolling Process

Steel billets are heated and passed through rolling mills to form steel bars.

Benefits:

• Improved productivity
• Stable mechanical properties
• Suitable for large-size bars

3. Forging Process

Steel is shaped under high pressure and temperature.

Advantages:

• Improved grain structure
• Higher toughness
• Better fatigue resistance

4. Cold Drawing Process

The steel bar is pulled through precision dies at room temperature.

This process improves:

• Dimensional accuracy
• Surface smoothness
• Tensile strength

5. Quality Inspection

Finished products are inspected for:

• Chemical composition
• Mechanical properties
• Diameter tolerance
• Surface quality

How To Choose

When selecting carbon steel bars, consider the following factors:

1. Application Requirements

• Construction → Q235, Q275
• Machinery parts → 45#, C45, S45C
• High-strength components → 42CrMo, 40Cr
• Spring applications → 65Mn, 60Si2Mn

2. Manufacturing Method

3. Mechanical Properties

Consider:

• Tensile strength
• Yield strength
• Hardness
• Wear resistance
• Impact resistance

4. Size and Surface Requirements

Confirm:

• Diameter
• Length
• Surface finish
• Tolerance

Syliath supports customized production according to customer drawings and technical specifications.

FAQ

Q1: What is carbon steel bar used for?

Carbon steel bars are widely used for machinery parts, automotive components, construction structures, shipbuilding, petrochemical equipment, and precision manufacturing.

Q2: What carbon steel grades can you supply?

We supply Q235, Q345, 45#, S45C, C45, AISI 1015, AISI 1020, AISI 1045, 42CrMo, 40Cr, 65Mn, GCr15, and other customized grades.

Q3: What is the difference between hot rolled and cold drawn carbon steel bar?

Hot rolled steel bars are suitable for general structural applications, while cold drawn steel bars provide higher dimensional accuracy and better surface quality for precision machining.

Q4: Can carbon steel bars be customized?

Yes. We can customize diameter, length, material grade, surface treatment, and processing according to customer requirements.

Q5: Are samples available before ordering?

Yes. Free samples can be provided for quality checking and testing. The shipping cost is normally paid by the buyer.

Manufacturer: Wuxi Sylaith Special Steel Co., Ltd.
Professional supplier of carbon steel bar, alloy steel bar, stainless steel products, and customized steel solutions for global industries.