Project Description
AISI 4145H Modified — Premium API Spec 7-1 Drill Tool Steel
Product Description
SHUNFU METAL offers premium AISI 4145H Modified steel, a specialized high-performance chromium-molybdenum alloy specifically engineered to meet the stringent requirements of API Spec 7-1, NS-1, and DS-1 specifications for critical drilling components. Available in hot rolled, forged solid, or bored round bars, our AISI 4145H Modified steel undergoes precision quenching and tempering to deliver exceptional mechanical properties, superior wear resistance, and outstanding toughness in demanding drilling environments.
As an API Q1 certified manufacturer with advanced heat treatment facilities, SHUNFU METAL ensures consistent quality through rigorous process controls. Each batch undergoes comprehensive testing by CNSA (China National Standards Association) to verify compliance with API specifications. Our AISI 4145H Modified steel is the preferred material for drill collars, heavyweight drill pipes, tool joints, subs, stabilizers, and other critical drilling components where exceptional strength, toughness, and fatigue resistance are essential for reliable performance in challenging oil and gas drilling operations.
Key Advantages
- API Spec 7-1 Compliance: Fully meets or exceeds the requirements of API Specification 7-1 for drill stem elements
- NS-1 and DS-1 Qualified: Satisfies the enhanced requirements of NS-1 and DS-1 specifications for premium drilling applications
- Superior Mechanical Properties: Exceptional strength, hardness, and toughness through optimized chemistry and heat treatment
- Excellent Hardenability: Consistent properties throughout large cross-sections
- Enhanced Wear Resistance: Significantly improved resistance to abrasive wear in drilling operations
- Improved Fatigue Performance: Higher resistance to cyclic loading encountered in drilling operations
- Exceptional Toughness: Superior impact properties with minimum average of 32 ft-lbs (44 J) at room temperature
- Consistent Through-Section Properties: Uniform hardness from surface to core
- 100% Ultrasonic Testing: Complete quality verification with ultrasonic inspection to API Spec 7-1, NS-1, and DS-1 requirements
- CNSA Verification: Each batch independently tested by China National Standards Association
Chemical Composition
SHUNFU METAL’s AISI 4145H Modified steel features a carefully controlled chemistry to achieve optimal mechanical properties:
Chemical Analysis (Weight %)
| OD Range | Element | Minimum % | Maximum % |
|---|---|---|---|
| Up to 10″ (254mm) | Carbon (C) | 0.43 | 0.48 |
| Silicon (Si) | 0.20 | 0.35 | |
| Manganese (Mn) | 0.75 | 1.10 | |
| Phosphorus (P) | – | 0.025 | |
| Sulfur (S) | – | 0.025 | |
| Chromium (Cr) | 0.95 | 1.20 | |
| Molybdenum (Mo) | 0.15 | 0.35 | |
| Nickel (Ni) | – | 0.25 | |
| Copper (Cu) | – | 0.35 | |
| Over 10″ (254mm) | Carbon (C) | 0.43 | 0.48 |
| Silicon (Si) | 0.20 | 0.35 | |
| Manganese (Mn) | 0.75 | 1.10 | |
| Phosphorus (P) | – | 0.025 | |
| Sulfur (S) | – | 0.025 | |
| Chromium (Cr) | 0.95 | 1.30 | |
| Molybdenum (Mo) | 0.15 | 0.35 | |
| Nickel (Ni) | – | 0.50 | |
| Copper (Cu) | – | 0.35 |
Role of Key Alloying Elements
- Carbon (0.43-0.48%): Higher carbon content than standard 4145 provides enhanced hardness, strength, and wear resistance
- Chromium (0.95-1.30%): Improved hardenability, wear resistance, and high-temperature strength, with higher levels in larger sections
- Molybdenum (0.15-0.35%): Enhances hardenability, prevents temper embrittlement, and improves high-temperature strength
- Manganese (0.75-1.10%): Contributes to hardenability and overall strength
- Nickel (up to 0.50% in larger sizes): Enhances hardenability in larger sections and improves impact toughness
- Silicon (0.20-0.35%): Acts as a deoxidizer and strengthening agent
- Low Phosphorus and Sulfur (≤0.025%): Ensures superior cleanliness, improved toughness, and fatigue resistance
Mechanical Properties
SHUNFU METAL’s AISI 4145H Modified steel in quenched and tempered condition meets or exceeds API Spec 7-1, NS-1, and DS-1 requirements with the following mechanical properties:
Tensile Properties (per API Spec 7-1)
| OD Range | Tensile Strength (UTS) | Yield Strength (0.2% YS) | Elongation (% in 2″) | Reduction of Area (%) | ||
|---|---|---|---|---|---|---|
| Min. ksi | Max. ksi | Min. ksi | Max. ksi | |||
| Up to 7″ (178mm) | 140 | 165 | 120 | 140 | 14 | 45 |
| 7″ to 10″ (178-254mm) | 130 | 160 | 115 | 135 | 14 | 45 |
| Over 10″ (254mm) | 125 | 155 | 105 | 125 | 14 | 45 |
Impact Properties
| Impact Test: ASTM A370, Charpy V-notch, Longitudinal, Temperature: +68°F (+20°C), per batch | |
|---|---|
| Minimum Average | 32 ft-lbs (44 J) |
Hardness Requirements
| Surface Hardness test on each product | |
|---|---|
| Range | 285 HB – 340 HB |
| Sub-Surface Hardness test per batch | |
|---|---|
| Range | 285 HB – 340 HB |
Note: On request, mechanical properties can be determined on test specimens taken at mid-radius. NS-1 and DS-1 properties and certification are provided upon request.
Testing and Quality Assurance
SHUNFU METAL’s AISI 4145H Modified steel undergoes comprehensive testing to ensure compliance with API Spec 7-1, NS-1, and DS-1 requirements:
Mechanical Testing
- Tensile Testing: Performed according to API Spec 7-1, NS-1, and DS-1 requirements
- Test specimens are obtained from the end of the bar
- Specimens are machined at either the center point or at a minimum of 4″ (100 mm) from the end of the bar
- Testing is conducted in the longitudinal direction with the centerline of the specimen located 1″ (25.4 mm) from the outside surface
- Impact Testing: Charpy V-notch testing per ASTM A370
- Impact specimens are radially notched
- Testing performed at room temperature (+68°F/+20°C)
- Minimum average value of 32 ft-lbs (44 J)
- Hardness Testing:
- Surface hardness testing on every product
- Sub-surface hardness testing per batch
- Hardness range: 285-340 HB
- Optional Testing:
- Mid-radius testing available upon request
- Enhanced NS-1 and DS-1 testing available upon request
Non-Destructive Examinations
- Ultrasonic Testing: 100% ultrasonic inspection per API Spec 7-1, NS-1, and DS-1 procedures
- Surface Defects Inspection: Comprehensive surface examination per API Spec 7-1, NS-1, and DS-1 requirements
- CNSA Verification: Each batch undergoes independent testing by China National Standards Association
Manufacturing Process
SHUNFU METAL’s AISI 4145H Modified steel undergoes a specialized manufacturing process to ensure premium quality and consistent properties:
Production Methods
- Hot Rolling: Precision controlled hot rolling process
- Forging: Advanced forging techniques for optimal grain flow and mechanical properties
- Boring (for hollow products): Precision boring capabilities for hollow drill collars and other components
Heat Treatment
- Quenching: Advanced quenching techniques to achieve uniform properties throughout the cross-section
- Tempering: Precision controlled tempering to achieve the specified mechanical properties
- Temperature Control: Computer-controlled furnaces with digital recording capabilities
- Batch Traceability: Complete heat treatment records maintained for each production batch
Quality Assurance
- API Q1 Certified: All manufacturing processes comply with API Q1 quality management system
- Full Traceability: Complete documentation from melt to final inspection
- Batch Testing: Comprehensive mechanical and metallurgical testing per batch
- Dimensional Control: Precise monitoring of product dimensions
- Surface Quality: Rigorous inspection for surface defects
Finish and Appearance
SHUNFU METAL’s AISI 4145H Modified steel products comply with ASTM A322 standards for finish and appearance, ensuring high-quality surface conditions suitable for the most demanding drilling applications.
Surface Finish Options
- Hot Rolled: Standard finish for general applications
- Forged: For custom forged components
- Machined: Precision machined surfaces for critical applications
- Bored: Precision internal bores for hollow components
Applications
AISI 4145H Modified steel from SHUNFU METAL is specifically engineered for critical drilling applications in the oil and gas industry:
Drilling Components
- Drill Collars: Heavy-walled tubular components providing weight and stiffness to the drill string
- Heavyweight Drill Pipe: Transition components between drill pipe and drill collars
- Tool Joints: Critical connection components in drill strings
- Subs: Connection components between different parts of the drill string
- Stabilizers: Components that maintain drill string alignment
- Reamers: Tools used to enlarge or smooth wellbore sections
- Crossovers: Transition components connecting different thread types
- Drill Jars: Mechanical devices used to deliver impact force to free stuck drill strings
- Kelly Valves: Safety components used in drilling operations
- Fishing Tools: Specialized tools for recovering lost equipment in the wellbore
Other Applications
- Downhole Motors: Components for directional drilling systems
- MWD/LWD Components: Parts for measurement and logging while drilling systems
- BOP Components: Critical parts for blowout preventers
- High-Stress Fasteners: Bolts and studs for critical drilling equipment connections
Specifications and Compliance
SHUNFU METAL’s AISI 4145H Modified steel meets or exceeds the following specifications:
- API Spec 7-1: Specification for Drill Stem Elements
- NS-1: NOV’s enhanced material specifications for drilling components
- DS-1: Fearnley Procter Group’s drilling specifications
- ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
- ASTM A370: Standard Test Methods and Definitions for Mechanical Testing of Steel Products
Certifications
- API Q1: American Petroleum Institute Quality Management System
- ISO 9001: Quality Management System
- CNSA: China National Standards Association verification
Product Forms and Sizes
SHUNFU METAL offers AISI 4145H Modified steel in various forms to meet diverse application requirements:
Available Forms
- Hot Rolled Solid Bars: For manufacturing various drilling components
- Forged Solid Bars: Enhanced grain flow and mechanical properties
- Bored Round Bars: For hollow drilling components like drill collars
Size Range
- Outside Diameter: From 2″ (50.8mm) up to 12″ (304.8mm)
- Inside Diameter (for bored products): Various IDs available according to application requirements
- Length: Standard and custom lengths available
AISI 4145H Modified vs. Standard 4145: Comparative Advantages
Understanding the performance benefits of AISI 4145H Modified compared to standard 4145 steel:
| Performance Characteristic | Standard 4145 | 4145H Modified Advantage |
|---|---|---|
| API Compliance | May not fully comply | Fully compliant with API Spec 7-1, NS-1, and DS-1 |
| Chemistry Control | Standard | Enhanced with tighter ranges and improved balance |
| Carbon Content | Variable | Optimized at 0.43-0.48% for enhanced strength and wear resistance |
| Chromium Content | Standard | Enhanced (0.95-1.30%) for improved hardenability and wear resistance |
| Cleanliness | Good | Superior with lower P and S limits (≤0.025%) |
| Through-Hardening | Good | Superior in larger sections due to enhanced alloy content |
| Impact Toughness | Good | Enhanced with guaranteed minimum average of 32 ft-lbs (44 J) |
| Testing Rigor | Standard | Comprehensive per API Spec 7-1, NS-1, and DS-1 requirements |
| Documentation | Standard | Enhanced with full traceability and batch certification |
| Performance in Drilling | Good | Superior wear resistance and fatigue performance |
Technical Support and Services
SHUNFU METAL provides comprehensive technical support to help customers maximize the performance of our AISI 4145H Modified steel:
- Application Engineering: Expert assistance in selecting optimal material for specific drilling applications
- Heat Treatment Consultation: Recommendations for optimal heat treatment parameters
- Testing Support: Custom testing programs to verify specific property requirements
- Failure Analysis: Investigation and root cause analysis of material-related issues
- Machining Recommendations: Guidelines for optimal machining parameters
- Thread Design Support: Technical guidance for thread design and machining
- Enhanced Documentation: Comprehensive certification packages including detailed processing history
- Field Performance Monitoring: Collaboration in tracking and optimizing material performance
Why Choose SHUNFU METAL for AISI 4145H Modified
Selecting SHUNFU METAL as your supplier for AISI 4145H Modified steel provides numerous advantages:
- API Spec 7-1 Expertise: Specialized knowledge in manufacturing drill stem materials to API specifications
- API Q1 Certification: Manufacturing processes certified to API Q1 quality management system
- NS-1 and DS-1 Capability: Able to meet enhanced requirements of these premium specifications
- CNSA Verification: Each production batch undergoes independent testing by the China National Standards Association
- Comprehensive Testing: 100% ultrasonic testing and rigorous mechanical property verification
- Technical Expertise: Our metallurgists and engineers have extensive experience with drilling steels
- Global Supply Capability: Ability to serve drilling operations worldwide
- Custom Solutions: Ability to tailor products to meet specific customer requirements
- Complete Traceability: Full documentation from melt to final inspection
- Proven Field Performance: Materials with demonstrated reliability in challenging drilling environments
Request Information
Contact SHUNFU METAL today to discuss your AISI 4145H Modified steel requirements. Our technical team is ready to assist you with:
- Detailed technical specifications
- NS-1 and DS-1 specific requirements
- 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.
