Project Description
AISI 4147 Steel Round Bar
AISI 4147 is a high-carbon, chromium-molybdenum alloy steel renowned for its exceptional hardenability, high tensile strength, and superior wear resistance. The chromium content enhances deep hardening, while molybdenum ensures uniform strength and mitigates temper brittleness. As a top-10 supplier to global oilfield service companies, Hunan ShunFu Metal Material Co., Ltd. specializes in manufacturing AISI 4147 Steel Round Bar specifically engineered for demanding oil & gas and mining environments. Backed by our API Q1 and ISO 9001 certifications, our 22 metallurgy engineers possess the technical authority and extensive export experience to deliver this grade with uncompromising material integrity and performance.
Equivalent Grades
| Standard | Grade / Designation |
|---|---|
| UNS | G41470 |
| ASTM / SAE | 4147 |
| EN / DIN | 48CrMo4 (Closest Equivalent) |
| JIS | SCM445 (Closest Equivalent) |
Applications
- Drill Collar Blanks (Oil & Gas / Drilling): Supplied by ShunFu Metal as precision-machined hollow bars, utilizing our in-house BTA deep hole drilling and long-distance gunhole drilling equipment for perfect concentricity.
- Downhole Tool Joints (Oil & Gas): Delivered as forged round bars, fully quenched and tempered in our API-calibrated heat treatment furnaces to guarantee maximum resistance to torsional stress.
- Valve Body Forgings (Oil & Gas): Supplied as custom forged blocks featuring a high forging ratio, ensuring a dense, uniform grain structure that withstands high-pressure fluid environments.
- Heavy-Duty Pump Shafts (Mining): Provided as peeled or precision-ground AISI 4147 Steel Round Bar, strictly machined by our CNC lathes to meet tight dimensional tolerances for immediate assembly.
Specifications & Standards
- ASTM A29 / A29M: Standard Specification for General Requirements 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
ShunFu Metal strictly organizes production according to these standards and can issue corresponding material certificates based on specific customer requirements.
Available Sizes & Delivery
ShunFu Metal offers a highly flexible size range for AISI 4147 Steel Round Bar, flat bars, forged blocks, and hollow bars to meet diverse project demands. Our advanced forging capabilities ensure a high forging ratio and excellent grain structure. Combined with our API-calibrated heat treatment and precision machining equipment—including BTA boring, CNC lathes, and long-distance gunhole drilling—we deliver components ready for final processing.
- Ready Stock
- Common sizes are available for immediate dispatch (MOQ: 1 piece, delivery in ~7 days).
- Custom Forged / Rolled
- For tailored dimensions, MOQ is typically 3 tons with a ~30-day lead time.
- Small Batch Special Melts
- Equipped with small induction furnaces, we accommodate 3–5 ton custom melts.
- Large Volume Orders
- Our 30–60 ton EAF capacity ensures rapid delivery for major projects.
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.45 – 0.50 |
| Manganese (Mn) | 0.75 – 1.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | 0.15 – 0.30 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
Note: We can fine-tune the chemical composition within standard limits to meet your specific mechanical property requirements.
ShunFu Metal utilizes in-house spectrometry to conduct rigorous pre-furnace and post-furnace chemical analysis, ensuring every heat of our AISI 4147 Steel Round Bar strictly complies with specification requirements.
Melting & Processing
ShunFu Metal provides tailored melting routes. Our standard process utilizes EAF + LF + VD for exceptional purity. For higher fatigue resistance, we offer ESR or PESR. For the most critical applications, VIM + VAR is available. Customers can negotiate the optimal metallurgical solution directly with our engineering team.
Mechanical Properties
(Typical properties for Quenched & Tempered condition at room temperature)
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm) | 1000 – 1150 MPa |
| Yield Strength (Rp0.2) | 850 – 950 MPa |
| Elongation (A5) | ≥ 12% |
| Reduction of Area (Z) | ≥ 45% |
| Hardness | 28 – 34 HRC |
ShunFu Metal issues comprehensive mechanical property test reports from our fully equipped, accredited metal laboratory prior to delivery, with all data fully traceable to the specific heat and batch number.
Heat Treatment
| Treatment Type | Temperature Range | Cooling Method |
|---|---|---|
| Normalizing | 870°C | Air Cool |
| Annealing | 815°C | Furnace Cool |
| Hardening (Austenitizing) | 840°C – 870°C | Oil Quench |
| Tempering | 540°C – 680°C | Air Cool |
ShunFu Metal's heat treatment furnaces are strictly calibrated in accordance with API standards on a regular schedule. This guarantees exceptional temperature uniformity and process repeatability, providing a highly reliable and consistent heat treatment result for every batch of AISI 4147 steel.
Surface Finish & Machining
Leveraging our in-house precision machining facility, ShunFu Metal delivers AISI 4147 Steel Round Bar in various surface conditions. We offer rough turning, centerless grinding, and precision milling. For downhole tools, our CNC machining, BTA deep hole drilling, and long-distance gunhole drilling achieve exact internal tolerances. To enhance fatigue life, we provide roller burnishing and shot peening services. Depending on the method, we routinely achieve surface roughness values down to Ra 0.8μm and tight dimensional tolerances (h9–h11). These factory-direct capabilities eliminate the need for third-party processing, saving you time and ensuring consistent quality.
Quality Assurance & Inspection
ShunFu Metal enforces strict pre-production, in-process, and post-production quality controls. Every AISI 4147 Steel Round Bar undergoes 100% Ultrasonic Testing (UT), chemical analysis, and dimensional verification. We conduct comprehensive mechanical testing, metallographic examination, and four-quadrant hardness testing to guarantee uniform strength across the cross-section. Holding API Q1 and ISO 9001 certifications means our quality management system meets the most rigorous oilfield standards. We provide EN 10204 3.1 certificates with every shipment, and 3.2 certification is available upon request. We also welcome third-party inspections from agencies like SGS or TÜV.
Packing & Shipping
Black surface materials are securely wire-bundled to prevent transit damage. Bright or precision-machined products receive multi-layer protective packaging and heavy anti-rust oil coating to ensure zero corrosion during ocean freight. Exporting to over 50 countries, ShunFu Metal seamlessly accommodates all destination port packaging and documentation requirements.
Frequently Asked Questions
Can ShunFu Metal supply AISI 4147 Steel Round Bar to API specifications?
Yes. Because we hold API Q1 certification and are a primary supplier to the world’s top 10 oilfield service companies, our metallurgy engineers ensure that all melting, forging, and heat treatment processes strictly align with API requirements for oil and gas applications.
What is the minimum order quantity (MOQ) for AISI 4147 Steel Round Bar?
For standard sizes in our ready stock, we can supply starting from just 1 piece with a delivery time of about 7 days. For custom forged or rolled sizes, the MOQ is typically 3 tons. We also have small induction furnaces to accommodate special 3–5 ton custom melts.
Can you provide pre-machined hollow bars from this grade?
Absolutely. Instead of purchasing solid round bars and machining them yourself, ShunFu Metal can utilize our in-house BTA boring and long-distance gunhole drilling equipment to supply you with precision-machined hollow bars, drastically reducing your manufacturing time and material waste.