Project Description
AISI 4150 Steel Round Bar – High Strength Oil & Gas Grade
Executive Summary
AISI 4150 represents the premium tier of chrome-molybdenum alloy steels engineered for severe oilfield environments. This high-carbon variant delivers exceptional hardenability and fatigue resistance, making it the preferred choice for critical drilling components operating under extreme downhole conditions. SHUNFU METAL supplies AISI 4150 in API 6A/7-1 compliant condition with guaranteed NACE MR0175 sour service capability.
Our manufacturing process ensures complete Q+T (Quenched & Tempered) heat treatment with precise hardness control at 22 HRC maximum to prevent sulfide stress cracking. Available in rolled, forged, and rough-turned conditions with full UT inspection per ASTM A388 Class C/c standards. Check our hollow bar inventory for immediate availability of premium oilfield grades.
Critical Standards & Material Equivalents
International Standards
- ASTM A29/A29M: Standard Specification for General Requirements
- AISI 4150: Chrome-Molybdenum Steel
- DIN 1.7220 (42CrMo4): European Equivalent
- JIS SCM440: Japanese Standard
Oilfield Compliance
- API Spec 7-1: Drill String Components
- API 6A: Wellhead & Christmas Tree Equipment
- NACE MR0175/ISO 15156: Sour Service Environment
- API 5CT: Casing & Tubing Applications
Technical Specifications
Chemical Composition (Ladle Analysis)
| Element | Min % | Max % | SHUNFU Control | Impact on Properties |
|---|---|---|---|---|
| Carbon (C) | 0.48 | 0.53 | 0.50±0.02 | High strength, hardenability |
| Manganese (Mn) | 0.75 | 1.00 | 0.85±0.05 | Deoxidation, strength |
| Chromium (Cr) | 0.80 | 1.10 | 0.95±0.05 | Hardenability, wear resistance |
| Molybdenum (Mo) | 0.15 | 0.25 | 0.20±0.02 | Deep hardening, temper resistance |
| Sulfur (S) | – | 0.040 | ≤0.010 | SSC resistance critical |
| Phosphorus (P) | – | 0.035 | ≤0.010 | Improved toughness |
Mechanical Properties (Q+T Condition)
| Property | Specification | SHUNFU Guarantee | Test Method |
|---|---|---|---|
| Yield Strength | 655 MPa (95 ksi) min | 655-795 MPa | ASTM A370 |
| Tensile Strength | 850 MPa (125 ksi) min | 850-1000 MPa | ASTM A370 |
| Elongation | 12% min | 15% typical | ASTM A370 |
| Reduction of Area | 35% min | 45% typical | ASTM A370 |
| Hardness | 22 HRC max (NACE) | 19-22 HRC | ASTM E18 |
| Charpy Impact (-46°C) | 20 J min | 25 J typical | ASTM E23 |
Manufacturing Excellence & Quality Control
Forging Process
Minimum 4:1 forging ratio ensures complete grain refinement and elimination of center porosity. Our press forging capability extends to 600mm diameter with uniform deformation throughout the cross-section. Directional grain flow optimizes fatigue resistance in drilling applications.
Heat Treatment Precision
Computer-controlled quenching at 850°C followed by tempering at 600-650°C achieves optimal strength-toughness balance. Furnace atmosphere control prevents decarburization. Through-hardening capability to 200mm diameter with ±2 HRC uniformity guarantee.
NDT Inspection Protocol
100% ultrasonic testing per ASTM A388 Class C/c standard. ShunFu manufacturing capabilities include advanced UT equipment with 2mm FBH sensitivity. Magnetic particle inspection per ASTM E1444 for surface integrity verification.
Microstructural Control
| Parameter | Standard | SHUNFU Achievement |
|---|---|---|
| Grain Size | ASTM E112 Grade 5 or finer | Grade 6-7 typical |
| Inclusion Rating | ASTM E45 Method A | Type A: 1.5 max, Type B: 1.0 max |
| Decarburization | ASTM A1077 | Complete absence verified |
| Banding | ASTM A322 | Rating 2 maximum |
Value-Added Processing Services
Precision Machining Capabilities
SHUNFU operates dedicated machining centers for oilfield components with the following capabilities:
- BTA Deep Hole Boring: Up to 6000mm length, 25-400mm bore diameter with ±0.05mm tolerance
- CNC Rough Turning: Optimized surface finish for UT inspection, Ra 12.5μm standard
- Gun Drilling: Precision tool joint connections and fluid passages
- Heat Treatment Integration: In-house Q+T eliminates transportation risks and dimensional control
Critical Applications in Oil & Gas Operations
Drilling Equipment
- Heavy Weight Drill Pipe (HWDP) tool joints
- Drill collar connections and bodies
- Stabilizer blades and sleeves
- Rotary steerable components
Wellhead Systems
- Christmas tree valve blocks
- Wellhead housing bodies
- High-pressure flanges and fittings
- Choke and kill line components
Subsea Applications
- BOP stack components
- Riser connection hardware
- Manifold valve bodies
- Umbilical termination assemblies
Sour Service Performance
AISI 4150 in Q+T condition with controlled hardness demonstrates superior resistance to sulfide stress cracking (SSC) and hydrogen induced cracking (HIC). Laboratory testing confirms compliance with NACE TM0177 Method A at 22 HRC hardness level. Critical for H2S environments exceeding 0.05 psia partial pressure.
Available Size Ranges & Delivery Conditions
| Product Form | Diameter Range | Length | Surface Condition | Standard Delivery |
|---|---|---|---|---|
| Hot Rolled Bars | 16-150mm | 6-12m | Black/Descaled | Normalized + Tempered |
| Forged Rounds | 80-600mm | 1-6m | Machined/UT Tested | Q+T Condition |
| Rough Turned | 100-500mm | 2-6m | Ra 12.5μm | Q+T + UT Class C/c |
| Hollow Bars | 150-400mm OD | 2-6m | BTA Bored | Q+T + Full Inspection |
Special Tolerances Available
- Diameter: ±0.5mm for rough turned, ±0.1mm for finish machined
- Length: +25mm/-0mm standard, closer tolerance on request
- Straightness: 1.5mm/meter maximum deviation
- Concentricity: 0.5mm TIR for hollow bars
Frequently Asked Questions
Material Certification & Testing
Q: What certificates do you provide with AISI 4150 deliveries?
A: Every shipment includes EN 10204 3.1 Mill Test Certificate with complete chemical analysis, mechanical properties, and heat treatment details. Third-party inspection available through SGS, BV, or customer-specified agencies.
Q: Can you guarantee NACE compliance for sour service?
A: Absolutely. Our Q+T process maintains 22 HRC maximum hardness with documented SSC testing per NACE TM0177. S and P content controlled to 0.010% maximum ensures optimal sour service performance.
Q: What is your UT inspection capability?
A: We perform 100% UT per ASTM A388 with Class C/c sensitivity (2mm FBH). Advanced equipment includes automated scanning systems with permanent recording capability for critical applications.
Processing & Delivery
Q: Do you stock AISI 4150 or manufacture to order?
A: We maintain strategic inventory of popular sizes in Q+T condition. Custom sizes typically require 4-6 weeks for forging and heat treatment. Contact our sales team for current stock availability.
Q: Can you provide machining services?
A: Yes, our in-house machining centers handle rough turning, BTA boring, and precision operations. This integration ensures traceability and eliminates risks associated with external processing.
Ready to Source Premium AISI 4150 Steel?
Get immediate access to technical specifications, current inventory, and competitive pricing from China’s leading oilfield steel manufacturer. Our engineering team is ready to support your project requirements.
📧 Technical Inquiries: [email protected]
🌐 Online Catalog: www.gaslinepipe.com
Fast Response Guarantee: Technical quotations within 4 hours | Stock confirmation within 1 hour | Samples available for qualification testing
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.
