China Forging Manufacturer Case Study: Large SAE 4340 and 4140 Forgings for Global Industries

How Jiangsu Hui Xuan Provides Large Forgings, Precision Machining and Quality-Controlled Manufacturing Solutions

Company Overview

JIANGSU HUI XUAN NEW ENERGY EQUIPMENT CO., LTD. is a professional China forging manufacturer specializing in custom steel forgings and precision-machined components for global industrial customers.

With strong capabilities in forging production, heat treatment, machining and quality management, Jiangsu Hui Xuan provides manufacturing solutions for demanding industries including:

• Mining equipment

• Energy equipment

• Heavy machinery

• Industrial transmission systems

• Engineering equipment

For customers in South America and other global markets, our competitive advantage is built on four key capabilities:

Large Forging Capability + Precision Machining + Quality Control + Cost Management

We help industrial customers transform raw steel materials into reliable finished components through an integrated manufacturing process.

Customer Challenge: Finding a Reliable Supplier for Large High-Strength Forgings

For heavy industrial equipment, forged components often operate under:

• High loads

• Continuous working conditions

• Mechanical impact

• Long service requirements

Customers are not only looking for a forging supplier. They need a manufacturing partner who can control the complete process:

• Material selection

• Forging quality

• Heat treatment performance

• Machining accuracy

• Mechanical testing

• Quality documentation

A supplier with only forging capability may require additional machining and inspection suppliers, increasing:

• Supply chain complexity

• Communication costs

• Delivery risks

• Quality management difficulty

Jiangsu Hui Xuan provides a complete manufacturing solution:

Steel Material → Forging → Heat Treatment → Precision Machining → Inspection → Delivery

Project Background: Large SAE 4340 and SAE 4140 Forged Components

For project OC-156.984, OC-156.985 and OC-156.986, Jiangsu Hui Xuan manufactured a series of large forged components requiring strict dimensional control and high mechanical performance.

The project materials included:

• SAE 4340

• SAE 4140

• SAE 1045

• SAE 1020

These materials are widely used for:

• Heavy machinery components

• Power transmission parts

• High-load mechanical systems

• Industrial equipment applications

The project included large shaft and ring-type forgings, such as:

• Ø400 × 2045 mm shaft components

• Ø475 × 2055 mm shaft components

• Ø700 × Ø360 × 560 mm ring components

• Ø3830 × Ø3580 × 560 mm large forged rings

• Ø4050 × Ø3800 × 608 mm large forged rings

These dimensions demonstrate Jiangsu Hui Xuan’s capability in manufacturing large-scale forged components.

SAE 4340 Forging Capability: High Strength for Heavy Industrial Applications

SAE 4340 is a high-strength alloy steel widely used for components requiring excellent toughness and fatigue resistance.

For this project, SAE 4340 forgings required mechanical properties including:

• Tensile strength up to 1000 MPa

• Yield strength up to 825 MPa

• Elongation up to 15%

• Impact energy up to 40J

For higher-performance components, requirements reached:

• Tensile strength: 1175 MPa

• Yield strength: 1000 MPa

• Impact energy: 35J

These requirements demonstrate Jiangsu Hui Xuan’s ability to manufacture performance-controlled forgings instead of simple forged blanks.

SAE 4140 Forging Capability: Stable Mechanical Performance

SAE 4140 is another important alloy steel used for industrial components requiring strength, toughness and wear resistance.

The project requirements included:

• Tensile strength: 825 MPa

• Yield strength: 655 MPa

• Elongation: 16%

• Impact energy: 40J

Through controlled forging and heat treatment processes, Jiangsu Hui Xuan ensures consistent material performance throughout the component.

Controlled Forging and Heat Treatment Process

Large forgings require strict control from the beginning of production.

Jiangsu Hui Xuan manages the complete manufacturing process:

1. Material Control

Materials include:

• SAE 4340

• SAE 4140

• SAE 1045

• SAE 1020

Chemical composition is controlled according to customer requirements.

For example:

SAE 4340:

• Carbon: 0.38–0.43%

• Chromium: 0.70–0.90%

• Molybdenum: 0.20–0.30%

• Nickel: 1.65–2.00%

SAE 4140:

• Carbon: 0.38–0.43%

• Chromium: 0.80–1.10%

• Molybdenum: 0.15–0.25%

2. Heat Treatment Control

The project required:

• Normalizing

• Quenching and Tempering (N+QT)

Controlled heat treatment provides:

• Stable hardness

• Improved toughness

• Better fatigue resistance

• Reliable service performance

Precision Machining Capability: Adding Value Beyond Forging

Many forging suppliers only provide rough forged components.

However, industrial customers often need finished parts with:

• Accurate dimensions

• Controlled tolerances

• Reduced additional processing

Jiangsu Hui Xuan combines forging and machining capability to provide:

Forging + Heat Treatment + Precision Machining + Inspection

This integrated model helps customers:

• Reduce supplier coordination

• Lower total manufacturing cost

• Improve quality consistency

• Shorten production communication cycles

For South American customers importing industrial components, this creates a more efficient and reliable supply chain.

Quality Control Based on International Standards

Jiangsu Hui Xuan applies strict inspection procedures for critical forged components.

Mechanical Testing

Testing includes:

• Tensile strength

• Yield strength

• Elongation

• Reduction of area

• Impact testing

Hardness Inspection

For shaft components:

• Hardness testing every 500 mm along the length direction

• Four measuring points at 90° positions

For ring components:

• Multi-level hardness inspection according to component height

Metallurgical Analysis and Non-Destructive Testing

To ensure internal quality, Jiangsu Hui Xuan supports:

Grain Size Inspection

Standard:

ASTM E112 Grade 5 or better

Non-Metallic Inclusion Inspection

Standard:

ASTM E45 Method A

Including:

• Sulfides

• Alumina

• Silicates

• Oxides

Ultrasonic Testing

Standard:

ASTM A388, 3mm FBH

These inspection standards provide confidence for customers requiring reliable heavy-duty components.

Quality Documentation and Manufacturing Traceability

For international industrial customers, Jiangsu Hui Xuan provides complete quality documentation, including:

• Material certificates

• Heat treatment curve reports

• Ultrasonic inspection reports

• Quality certificates

The company also provides production and testing records, including:

• Forging and heat treatment product photos

• Test sample photos

• Mechanical testing records

Cost Control Through Integrated Manufacturing

For global industrial customers, the lowest purchase price does not always mean the lowest total cost.

Total manufacturing cost includes:

Material Cost + Processing Cost + Quality Risk + Supplier Management Cost + Delivery Efficiency

Jiangsu Hui Xuan improves cost efficiency through:

• Optimized forging processes

• Internal machining capability

• Stable quality control

• Reduced supplier coordination

This allows customers to achieve better value through reliable manufacturing.

Why Choose Jiangsu Hui Xuan as Your Forging Partner

Large Forging Capability

Experience with:

• Large diameter forgings

• Heavy shafts

• Ring-type components

• High-strength alloy steel parts

Material Expertise

Including:

• SAE 4340

• SAE 4140

• SAE 1045

• SAE 1020

Precision Manufacturing

From forged steel to finished components.

Reliable Quality Management

Based on:

• ASTM standards

• Mechanical testing

• Metallurgical inspection

• Non-destructive testing