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AISI 4142 chrome-molybdenum alloy steel

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AISI 4142 chrome-molybdenum alloy steel2026-04-29T05:55:05+00:00

Project Description

AISI 4142 Steel Round Bar — Premium Cr-Mo Alloy for Demanding Applications

AISI 4142 Steel Round Bar — Cr-Mo alloy steel bar by ShunFu Metal for oilfield drill collar blanks and downhole tool applications
AISI 4142 Steel Round Bar manufactured by ShunFu Metal — precision-engineered for oil & gas and mining sectors

AISI 4142 is a premium chromium-molybdenum (Cr-Mo) low-alloy steel renowned for its exceptional hardenability, high tensile strength, and superior toughness. The strategic addition of chromium and molybdenum enhances its wear resistance and impact strength, making it an ideal choice for critical load-bearing components.

As a trusted manufacturer serving the top 10 global oilfield service companies, ShunFu Metal specializes in supplying AISI 4142 for the demanding oil & gas and mining sectors. Backed by our API Q1 and ISO 9001 certifications and extensive experience exporting to over 50 countries, we guarantee that every AISI 4142 Steel Round Bar we produce meets the rigorous performance requirements of your most challenging environments.

Equivalent Grades

International cross-reference of AISI 4142 equivalent steel grades across major standards
US (AISI/SAE) Germany (DIN/EN) Europe (EN) Japan (JIS) China (GB)
4142 / 4140 1.7225 42CrMo4 SCM440 42CrMo

Applications

  • Drill Collar Blanks & Downhole Tools (Oil & Gas / Drilling): Supplied as precision-machined hollow bars by ShunFu Metal, utilizing our in-house BTA deep-hole drilling to ensure perfect concentricity for directional drilling applications. Our drill collar blanks are trusted by leading oilfield service companies worldwide.
  • Valve Body Forgings (Oil & Gas): Delivered as high-integrity forged round bars, complete with custom heat treatment by ShunFu Metal to withstand high-pressure, corrosive fluid control environments.
  • Pump Shafts & Rotors (Mining): Provided as turned and ground AISI 4142 Steel Round Bar, ensuring tight dimensional tolerances for heavy-duty mining and slurry pumps.
  • Heavy-Duty Gears & Pinions (Mining / Industrial): Supplied as forged blanks, with ShunFu Metal offering tailored spheroidizing annealing to maximize machinability before your final gear cutting process.

Specifications & Standards

ShunFu Metal strictly organizes production according to these international standards and can issue corresponding material test certificates (MTC) tailored to your specific project requirements.

  • 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
  • ASTM A331: Standard Specification for Steel Bars, Alloy, Cold-Finished
  • EN 10083-3: Steels for quenching and tempering (covers equivalent 42CrMo4)
  • API Spec 7-1: Specification for Rotary Drill Stem Elements (applicable to chemical/mechanical requirements)

For drill pipe and related downhole components, our AISI 4142 material fully satisfies the stringent requirements outlined in API Spec 7-1 and can be certified accordingly.

Available Sizes & Delivery

ShunFu Metal offers a highly flexible size range for AISI 4142 Steel Round Bar, flat bars, and hollow tubes. Our advanced forging capabilities ensure a high forging ratio and refined grain structure, while our API-calibrated heat treatment and precision machining (including BTA boring, CNC, and long-distance gunhole drilling) guarantee exact dimensions.

  • Ready Stock: Common grades and sizes are available for single-piece orders with a fast delivery of approximately 7 days.
  • Custom Forged/Rolled: Standard MOQ is 3 tons, with a delivery time of approximately 30 days.
  • Small Batch Special Melts: Utilizing our specialized small induction furnaces, we can melt custom chemistries starting at just 3–5 tons.
  • Large Volume Orders: Supported by our 30–60 ton Electric Arc Furnaces (EAF) for rapid, large-scale fulfillment.

Chemical Composition

ShunFu Metal verifies every heat through rigorous in-house spectrometry prior to pouring, ensuring all elemental contents strictly comply with specification requirements. We can also micro-adjust the chemical composition to meet your specific mechanical performance goals.

Chemical composition comparison — ASTM A29 (AISI 4142) vs. EN 10083-3 (42CrMo4)
Element ASTM A29 (AISI 4142) % EN 10083-3 (42CrMo4) %
Carbon (C) 0.40 – 0.45 0.38 – 0.45
Manganese (Mn) 0.75 – 1.00 0.60 – 0.90
Phosphorus (P) ≤ 0.035 ≤ 0.025
Sulfur (S) ≤ 0.040 ≤ 0.035
Silicon (Si) 0.15 – 0.35 ≤ 0.40
Chromium (Cr) 0.80 – 1.10 0.90 – 1.20
Molybdenum (Mo) 0.15 – 0.25 0.15 – 0.30

Melting & Processing

ShunFu Metal offers flexible melting routes: EAF + LF + VD (Electric Arc Furnace + Ladle Furnace + Vacuum Degassing) for standard applications, ESR/PESR (ESR / Protective Atmosphere Electroslag Remelting) for higher purity, and VIM + VAR (VIM + VAR) for critical demands. Customers can consult with our engineers to select the optimal, customized melting solution.

Learn more about our manufacturing capabilities and quality systems on our About Us page.

Mechanical Properties

Typical properties for AISI 4142 in the Quenched and Tempered condition at room temperature:

Mechanical properties of AISI 4142 — quenched and tempered condition
Property Metric Value Imperial Value
Tensile Strength (Rm) 1000 – 1200 MPa 145 – 174 ksi
Yield Strength (Rp0.2) ≥ 850 MPa ≥ 123 ksi
Elongation (A5) ≥ 11% ≥ 11%
Reduction of Area (Z) ≥ 45% ≥ 45%
Hardness 28 – 34 HRC 269 – 321 HBW

ShunFu Metal provides comprehensive mechanical property test reports from accredited laboratories prior to delivery, with all data fully traceable to the specific heat and batch numbers.

Heat Treatment

Heat treatment process parameters for AISI 4142 steel
Process Temperature (°C) Cooling Method Purpose
Normalizing 860 – 900 Air cooling Refine grain structure, homogenize
Annealing 800 – 850 Furnace cooling Soften for machining
Quenching 830 – 860 Oil or Polymer Achieve martensitic structure
Tempering 540 – 680 Air cooling Relieve stress, reach target hardness

ShunFu Metal's heat treatment furnaces are strictly calibrated on a regular schedule in accordance with API standards. This guarantees exceptional temperature uniformity and process repeatability, providing a highly reliable and consistent heat treatment result for every batch of AISI 4142.

Surface Finish & Machining

Leveraging our factory-direct precision equipment, ShunFu Metal offers comprehensive machining for AISI 4142. We provide turning, grinding, and milling to achieve tight dimensional tolerances and surface roughness down to Ra 0.8. For downhole tools, our CNC lathes, BTA boring, and long-distance gunhole drilling deliver perfect concentricity. We also offer roller burnishing and shot peening to enhance fatigue life. By keeping all machining in-house, we ensure your components are delivered ready for final assembly or immediate deployment.

Quality Assurance & Inspection

ShunFu Metal enforces strict quality control at every stage. Our process includes 100% UT, chemical analysis, mechanical testing, and precise dimensional checks. We perform rigorous 4-quadrant hardness testing and metallographic examinations to verify structural integrity.

Holding API Q1 and ISO 9001 certifications means our AISI 4142 products consistently meet the highest oilfield safety standards. We issue EN 10204 3.1 certificates as standard, with 3.2 certification available via third-party agencies like SGS or TÜV upon request. Ultrasonic examination is performed per ASTM A388 for heavy steel forgings.

Packing & Shipping

For black surface products, we use heavy-duty steel wire bundling to prevent transit damage. Bright and precision-machined products receive multi-layer protective wrapping and anti-rust oil coating, ensuring a rust-free ocean voyage. With experience exporting to over 50 countries, ShunFu Metal seamlessly accommodates all destination port packing and documentation requirements.

Frequently Asked Questions

Can ShunFu Metal supply AISI 4142 Steel Round Bar to API or ASTM specifications?

Yes. Driven by our API Q1 certified quality management system, ShunFu Metal strictly manufactures AISI 4142 to comply with ASTM A29/A322 and applicable API Spec 7-1 requirements, complete with fully traceable material test certificates.

What is the minimum order quantity for this grade?

We offer highly flexible MOQs. We hold ready stock for single-piece orders (approx. 7-day delivery). For custom forgings, the MOQ is typically 3 tons. We also operate small induction furnaces to accommodate specialized 3–5 ton custom melts.

Can you provide deep-hole drilling and precision machining for AISI 4142 blanks?

Absolutely. ShunFu Metal is fully equipped with advanced BTA boring, CNC turning and milling, and long-distance gunhole drilling machines. We can supply fully machined hollow bars and drill collar blanks directly from our factory, eliminating your need for secondary processing.

ShunFu Metal Co., Ltd. is one of the largest high quality oilfields product manufacturers in China, and its products cover various oilfields such as gas pipe, oil casing, tubing, anti-corrosion line pipe, corrosion resistance alloy pipe, etc. …
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