Project Description
AISI 4130 — Premium Low Alloy Chromium-Molybdenum (CrMo) Steel
Product Description
SHUNFU METAL offers premium quality AISI 4130 low alloy Chromium-Molybdenum (CrMo) steel bars, engineered specifically for demanding oil field applications. This versatile material features a lower carbon content than 4140 steel, providing significantly improved weldability and enhanced machinability while maintaining excellent mechanical properties and hardenability. Our AISI 4130 bars are produced to meet rigorous industry standards, including API 6A and NACE MR0175 requirements, ensuring reliable performance in critical applications.
As an API Q1 certified manufacturer with fully calibrated and certified heat treatment furnaces, SHUNFU METAL delivers consistent quality through our QTC (Quench, Temper, and Control) procedure compliant with API 6A specifications. Each batch undergoes comprehensive testing by CNSA (China National Standards Association) to verify compliance with international standards and customer specifications. Our controlled manufacturing process ensures optimal microstructure, mechanical properties, and toughness, making our AISI 4130 steel the ideal choice for oil and gas equipment, pressure vessels, structural components, and other critical applications.
Key Advantages
- Superior Weldability: Lower carbon content (0.28-0.33%) compared to 4140 steel enables better weldability with reduced risk of cracking
- Excellent Machinability: Optimized chemistry for improved machinability while maintaining mechanical properties
- High Strength-to-Weight Ratio: Combines excellent strength with relatively low weight, ideal for weight-sensitive applications
- Good Low-Temperature Toughness: Maintains impact resistance at temperatures as low as -75°C
- NACE MR0175 Compliant: Suitable for sour service environments in oil and gas applications
- Consistent Quality: API Q1 certified manufacturing with rigorous quality control at every production stage
- Certified Heat Treatment: Controlled quenching and tempering in calibrated furnaces ensures consistent properties
- 100% Ultrasonic Testing: Complete quality assurance with ASTM A388 ultrasonic inspection
- Independent Verification: Each batch verified by CNSA for guaranteed compliance with specifications
- Fine Grain Structure: ASTM grain size 6 or finer for optimal strength and toughness
Chemical Composition
SHUNFU METAL’s AISI 4130 steel is manufactured with precisely controlled chemistry to ensure consistent properties:
| Element | Minimum % | Maximum % |
|---|---|---|
| Carbon (C) | 0.28 | 0.33 |
| Chromium (Cr) | 0.80 | 1.10 |
| Manganese (Mn) | 0.40 | 0.60 |
| Molybdenum (Mo) | 0.15 | 0.25 |
| Phosphorus (P) | – | 0.035 |
| Sulfur (S) | – | 0.040 |
| Silicon (Si) | 0.15 | 0.35 |
Role of Key Alloying Elements
- Chromium (0.80-1.10%): Enhances hardenability, improves corrosion and oxidation resistance, and contributes to high-temperature strength
- Molybdenum (0.15-0.25%): Increases hardenability, prevents temper embrittlement, improves creep resistance and high-temperature strength
- Carbon (0.28-0.33%): Provides strength while remaining low enough to maintain good weldability
- Manganese (0.40-0.60%): Enhances hardenability and deoxidizes the steel during manufacturing
- Silicon (0.15-0.35%): Acts as a deoxidizer and improves strength
Mechanical Properties
SHUNFU METAL’s AISI 4130 steel bars in hardened and tempered condition (75ksi variant) deliver the following mechanical properties:
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 75 ksi (517 MPa) | – |
| Ultimate Tensile Strength (UTS) | 95 ksi (655 MPa) | – |
| Elongation | 18% | – |
| Reduction of Area | 35% | – |
| Hardness (HRC) | 18 | 22 |
| Hardness (HBW) | 217 | 237 |
Impact Properties
| Test Temperature | Average Value | Minimum Single Value |
|---|---|---|
| Charpy V-Notch @ 23°C (73°F) | 100 J (74 ft-lb) | 80 J (59 ft-lb) |
| Charpy V-Notch @ -60°C (-76°F) | 27 J (20 ft-lb) | 20 J (15 ft-lb) |
| Charpy V-Notch @ -75°C (-103°F) | 19 J (14 ft-lb) | – |
Note: All properties are achieved using SHUNFU METAL’s QTC (Quench, Temper, and Control) procedure in accordance with API 6A requirements. Our certified heat treatment furnaces ensure consistent mechanical properties throughout the entire production lot.
Manufacturing Process
SHUNFU METAL’s AISI 4130 steel is manufactured using advanced processes that ensure premium quality and consistent properties:
Steel Production
- Melting: Electric Arc Furnace (EAF) with precise control of chemistry
- Refining: Advanced Ladle Refining for superior cleanliness
- Degassing: Vacuum Degassing to reduce hydrogen content and enhance mechanical properties
- Casting: Either Ingot Cast or Continuously Cast depending on specification requirements
- Reduction Ratio: Minimum 4:1 reduction ratio to ensure optimum grain flow and mechanical properties
Heat Treatment
- Certified Furnaces: All heat treatment performed in API-certified and regularly calibrated furnaces
- QTC Process: Controlled Quenching, Tempering, and Cooling procedure as set out in API 6A
- Temperature Monitoring: Continuous digital monitoring of temperature profiles during heat treatment
- Documentation: Complete heat treatment records maintained for traceability
Quality Assurance
- 100% Ultrasonic Testing: Every bar is ultrasonically tested per ASTM A388 with acceptance criteria in accordance with API 6A PSL 3&4
- CNSA Verification: Each batch undergoes independent testing by China National Standards Association
- Microstructural Examination: Verification of grain size (ASTM 6 or finer) and proper microstructure
- Mechanical Testing: Comprehensive testing for strength, hardness, and impact properties
- API Q1 Certified: All manufacturing processes comply with API Q1 quality management system
Applications
AISI 4130 alloy steel from SHUNFU METAL is ideal for numerous applications requiring an excellent combination of strength, toughness, and weldability:
Oil and Gas Industry
- Wellhead components
- Downhole tools
- Blow-out preventers (BOPs)
- Drilling equipment
- Pressure vessels and fittings
- Valve bodies and bonnets
- Subsea equipment
Aerospace and Defense
- Aircraft structural components
- Landing gear parts
- Engine mounts
- Fasteners and fittings
Automotive and Transportation
- Roll cages and chassis components
- Suspension components
- Transmission parts
- High-strength bolts and fasteners
General Engineering
- Heavy machinery components
- High-strength structural parts
- Tooling and fixtures
- Power transmission components
Specifications and Compliance
SHUNFU METAL’s AISI 4130 steel meets or exceeds the following specifications:
- ASTM A29/A29M: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought
- ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
- API 6A: Specification for Wellhead and Tree Equipment
- NACE MR0175/ISO 15156: Petroleum and natural gas industries — Materials for use in H₂S-containing environments in oil and gas production
- SAE J404: Chemical Compositions of SAE Alloy Steels
- ASTM A388: Standard Practice for Ultrasonic Examination of Steel Forgings
Certifications
- API Q1: American Petroleum Institute Quality Management System
- ISO 9001: Quality Management System
- CNSA: China National Standards Association verification
- ABS: American Bureau of Shipping approval
- DNV-GL: Det Norske Veritas – Germanischer Lloyd approval
Product Forms and Sizes
SHUNFU METAL offers AISI 4130 steel in the following forms:
Hot Rolled Bars
- Diameter Range: 3″ to 12″ (76.2mm to 304.8mm)
- Surface Conditions: Black, Peeled, or Smooth Turned
- Heat Treatment Condition: Hardened and Tempered to meet 75ksi minimum yield, 22HRc maximum (NACE MR0175 compliant)
- Straightness: 1mm in 500mm (1/8″ in 5″)
- Enhanced straightness available upon request
Machining Tolerances
For ‘Machining Quality Bar’ to ASTM A29 Tolerances, the minimum machining allowance is as follows:
| Ordered Surface Condition | Minimum Stock Removal |
|---|---|
| Peeled/Smooth Turned | 1% per side |
Note: For bars larger than 11.25″ (285.8mm) diameter, the central 20% of the bar will be excluded from ultrasonic testing.
Technical Support and Services
SHUNFU METAL provides comprehensive technical support to help customers maximize the performance of our AISI 4130 steel:
- Material Selection Guidance: Expert advice on grade selection for specific applications
- Heat Treatment Consultation: Recommendations for optimal heat treatment parameters to achieve desired properties
- Welding Technical Support: Guidelines for proper welding procedures and parameters
- Failure Analysis: Investigation and analysis of material-related issues
- Custom Testing: Additional mechanical, chemical, or metallurgical testing as required
- Research Collaboration: Technical partnerships for advanced material development
- Metallurgical Support: Access to experienced metallurgists for technical inquiries
- Quality Documentation: Comprehensive certification packages including MTRs, test reports, and compliance documentation
Why Choose SHUNFU METAL for AISI 4130
Selecting SHUNFU METAL as your supplier for AISI 4130 steel provides numerous advantages:
- API Q1 Certification: Our manufacturing processes are certified to API Q1 quality management system, ensuring consistent quality meeting oil and gas industry requirements
- Certified Heat Treatment Facilities: Our heat treatment furnaces are regularly calibrated and certified, guaranteeing precise temperature control and consistent properties
- QTC Testing Qualification: Our Quench, Temper, and Control procedures are qualified according to API 6A specifications, ensuring reliable mechanical properties
- CNSA Verification: Each production batch undergoes independent testing by the China National Standards Association, providing third-party verification of compliance
- Comprehensive Testing: 100% ultrasonic testing to API 6A PSL 3&4 standards, plus mechanical, chemical, and metallurgical analysis
- Technical Expertise: Our team of metallurgists and engineers has extensive experience with alloy steels and oil field applications
- Supply Chain Reliability: Global sourcing capabilities ensure stable supply and competitive pricing
- Custom Solutions: Ability to tailor products to meet specific customer requirements
- Complete Traceability: Full documentation from melt to final inspection
- Global Service: Worldwide distribution network and technical support
Request Information
Contact SHUNFU METAL today to discuss your AISI 4130 steel requirements. Our technical team is ready to assist you with:
- Detailed technical specifications
- Material selection guidance
- Custom size and property requirements
- Price quotations and delivery schedules
- Quality certification and documentation
- Technical support for your application
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
