Project Description
AISI 4140 — High-Performance Chromium-Molybdenum Alloy Steel
Product Description
SHUNFU METAL offers premium quality AISI 4140 chromium-molybdenum (CrMo) alloy steel bars, engineered to deliver superior performance in demanding applications. This versatile material provides significantly higher yield and fatigue strength, better through-hardening capabilities, and enhanced impact properties compared to plain carbon steels like 1045. Our AISI 4140 steel is produced to meet stringent industry standards, including NACE MR0175/ISO 15156 requirements for sour service environments and API 6A specifications for oil and gas equipment.
As an API Q1 certified manufacturer with fully calibrated and certified heat treatment furnaces (compliant with AMS 2750), SHUNFU METAL ensures consistent quality through rigorous process controls at every production stage. Each batch undergoes comprehensive testing by CNSA (China National Standards Association) to verify compliance with international standards and customer specifications. Available in both 80ksi and 110ksi yield strength variants, our AISI 4140 steel provides the ideal balance of strength, toughness, and hardenability for critical components in oil and gas, automotive, aerospace, and general industrial applications.
Key Advantages
- Superior Strength and Toughness: Higher yield strength, better fatigue performance, and enhanced impact properties compared to carbon steels
- Excellent Through-Hardening: Uniform properties from surface to core even in larger diameters
- Good Hardenability: Responds well to heat treatment for achieving desired mechanical properties
- Versatile Performance: Available in both NACE-compliant (80ksi) and high-strength (110ksi) variants to suit different application requirements
- Excellent Machinability: Well-balanced composition for good machining performance
- Certified Quality: API Q1 certified manufacturing with comprehensive quality assurance
- Controlled Heat Treatment: AMS 2750 compliant furnaces ensure precise temperature control and consistency
- 100% Ultrasonic Testing: Complete quality verification with ASTM A388 ultrasonic inspection to API 6A PSL 3&4 standards
- CNSA Verification: Each batch independently tested by China National Standards Association
- Full Traceability: Complete documentation from melt to final inspection
Chemical Composition
SHUNFU METAL’s AISI 4140 steel is manufactured with precisely controlled chemistry to ensure optimal properties:
| Element | Minimum % | Maximum % |
|---|---|---|
| Carbon (C) | 0.38 | 0.43 |
| Silicon (Si) | 0.15 | 0.35 |
| Manganese (Mn) | 0.75 | 1.00 |
| Phosphorus (P) | – | 0.035 |
| Sulfur (S) | – | 0.040 |
| Chromium (Cr) | 0.80 | 1.10 |
| Molybdenum (Mo) | 0.15 | 0.25 |
| Nickel (Ni) | – | 0.25 |
| Aluminum (Al) | 0.015 | 0.030 |
Role of Key Alloying Elements
- Carbon (0.38-0.43%): Provides strength and hardness while remaining in a range that maintains good balance with toughness
- 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
- Manganese (0.75-1.00%): Enhances hardenability and deoxidizes the steel during manufacturing
- Silicon (0.15-0.35%): Acts as a deoxidizer and improves strength
- Aluminum (0.015-0.030%): Controls grain size and deoxidizes the steel
Mechanical Properties
SHUNFU METAL offers AISI 4140 steel in two standard strength variants to meet different application requirements:
80ksi Variant (NACE MR0175/ISO 15156 Compliant)
Ideal for oil and gas applications requiring sour service compatibility:
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 80 ksi (552 MPa) | – |
| Ultimate Tensile Strength (UTS) | 100 ksi (690 MPa) | – |
| Elongation | 20% | – |
| Reduction of Area | 45% | – |
| Hardness (HRC) | 18 | 22 |
| Hardness (HBW) | 217 | 237 |
Impact Properties (80ksi Variant)
| Test Temperature | Average Value | Minimum Single Value |
|---|---|---|
| Charpy V-Notch @ 23°C (73°F) | 80 J (59 ft-lb) | – |
| Charpy V-Notch @ -32°C (-26°F) | 42 J (31 ft-lb) | 30 J (22 ft-lb) |
| Charpy V-Notch @ -46°C (-51°F) | 40 J (29 ft-lb) | 30 J (22 ft-lb) |
Note: 80ksi variant properties are verified on mid-radial location for 1-8″ diameter bars and at 1″ below surface for 1-12″ diameter bars.
110ksi Variant (High-Strength Version)
Suitable for applications requiring higher strength where sour service is not a concern:
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 110 ksi (758 MPa) | – |
| Ultimate Tensile Strength (UTS) | 125 ksi (862 MPa) | – |
| Elongation | 13% | – |
| Reduction of Area | 40% | – |
| Hardness (HRC) | 30 | 36 |
| Hardness (HBW) | 285 | 341 |
Impact Properties (110ksi Variant)
| Test Temperature | Average Value | Minimum Single Value |
|---|---|---|
| Charpy V-Notch @ 23°C (73°F) | 60 J (44 ft-lb) | – |
| Charpy V-Notch @ -10°C (14°F) | 42 J (31 ft-lb) | 30 J (22 ft-lb) |
| Charpy V-Notch @ -32°C (-26°F) | 30 J (22 ft-lb) | 20 J (15 ft-lb) |
Note: 110ksi variant properties are verified on mid-radial location for 1-7″ diameter bars.
Manufacturing Process
SHUNFU METAL’s AISI 4140 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 bottom-poured wide end up ingots or continuously cast, depending on product 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 AMS 2750 compliant, regularly calibrated furnaces
- Austenitizing: Controlled heating to austenitizing temperature
- Quenching: Liquid quenching for optimal hardenability
- Tempering: Precision tempering to achieve target mechanical properties
- Stress Relief: Available as stress-free or stress-relieved depending on customer requirements
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 5 or finer) and proper microstructure
- Mechanical Testing: Comprehensive testing for strength, hardness, and impact properties per ASTM standards (A370, E23, E18, E10)
- API Q1 Certified: All manufacturing processes comply with API Q1 quality management system
Applications
AISI 4140 alloy steel from SHUNFU METAL is ideal for numerous applications requiring an excellent combination of strength, toughness, and wear resistance:
Oil and Gas Industry
- Wellhead components
- Drill collars and tools
- Blowout preventers (BOPs)
- Valve bodies and bonnets
- Pressure containing components
- Downhole equipment
Automotive and Transportation
- Connecting rods
- Axle shafts
- Gears and sprockets
- Steering components
- High-strength fasteners
Industrial Equipment
- Conveyor pins
- Pump shafts
- Tool holders
- Collets and chucks
- Stem assemblies
- Heavy machinery components
Aerospace and Defense
- Landing gear components
- Structural parts
- High-strength fasteners
- Armor components
Specifications and Compliance
SHUNFU METAL’s AISI 4140 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
- SAE J404: Chemical Compositions of SAE Alloy Steels
- API 6A: Specification for Wellhead and Tree Equipment
- NACE MR0175/ISO 15156: Materials for use in H₂S-containing environments (80ksi variant)
- AMS 2301: Steel Cleanliness, Aircraft Quality
- AMS 2750: Pyrometry – heat treatment furnace requirements
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 4140 steel in the following forms:
Hot Rolled Bars
- Diameter Range: 1″ to 10″ (25.4mm to 254mm)
- Surface Conditions: Black, Peeled, or Smooth Turned
- Heat Treatment Condition:
- 80ksi variant: Hardened and Tempered to meet NACE MR0175/ISO 15156 requirements
- 110ksi variant: Hardened and Tempered for high-strength applications
- 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 |
| Black | 1.6% per side |
Note: For bars larger than 10.5″ (266.7mm) diameter, the central 20% of the bar will be excluded from ultrasonic testing.
Certification and Documentation
SHUNFU METAL provides comprehensive material test reports with each shipment, including:
- Chemical Analysis
- Heat Treatment Processing Parameters
- Mechanical Properties
- Surface Hardness
- Grain Size
- Reduction Ratio
- Non-Destructive Examination (NDE) Test Method and Criteria
Technical Support and Services
SHUNFU METAL provides comprehensive technical support to help customers maximize the performance of our AISI 4140 steel:
- Material Selection Guidance: Expert advice on grade selection for specific applications
- Heat Treatment Consultation: Recommendations for optimal heat treatment parameters
- Welding Technical Support: Guidelines for proper welding procedures
- 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
Why Choose SHUNFU METAL for AISI 4140
Selecting SHUNFU METAL as your supplier for AISI 4140 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
- AMS 2750 Compliant Heat Treatment: Our heat treatment furnaces are regularly surveyed and calibrated to AMS 2750 standards, guaranteeing precise temperature control and consistent 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 their 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 4140 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.
