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AISI 4150 chrome-moly steel

Home/Alloy Steel, Product/AISI 4150 chrome-moly steel
AISI 4150 chrome-moly steel2026-04-29T06:32:16+00:00

Project Description

AISI 4150 Alloy Steel

AISI 4150 alloy steel forged round bar with precision machined surface
AISI 4150 Alloy Steel Forged Bar

AISI 4150 is a premium medium-to-high-carbon chromium-molybdenum alloy steel recognized for its exceptional hardenability, uniform strength, and superior wear resistance. As an API Q1 and ISO 9001 certified manufacturer, ShunFu Metal specializes in engineering 4150 alloy steel specifically for the demanding environments of the oil & gas and mining sectors. With decades of accumulated metallurgical expertise, we currently supply top-tier 4150 materials to the world’s top 10 oilfield service companies. Our robust production capabilities and proven export experience to over 50 countries ensure that every batch of 4150 steel meets the stringent operational requirements of global drilling and extraction projects.

Equivalent Grades

Equivalent Specifications for 4150 Alloy Steel
Region / StandardDesignationASTM
US / InternationalAISI 4150 / SAE 4150ASTM A29 / A322

Applications

  • Drill Collar Blanks & Spindles (Drilling): Supplied as precision-machined hollow bars using in-house BTA deep hole drilling and gunhole drilling equipment, ensuring perfect concentricity and wall thickness for critical downhole operations.
  • Valve Body Forgings (Oil & Gas): Supplied by ShunFu Metal as custom forged round blocks, complete with API-compliant quenched and tempered (+QT) heat treatment to ensure maximum material integrity for high-pressure fluid control environments.
  • Heavy-Duty Shafts & Axles (Mining): Provided as high-forging-ratio round bars, rigorously ultrasonically tested by ShunFu Metal's quality control team to guarantee internal soundness under heavy torsional and impact loads.
  • Forged Gears & Sprockets (Industrial): Supplied in the soft annealed condition (+A) directly from our heat treatment facility, optimizing the steel's machinability for complex gear-cutting operations prior to final hardening.

Specifications & Standards

  • ASTM A29: Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
  • ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades

ShunFu Metal strictly organizes all production according to the above standards and can issue comprehensive material test certificates corresponding to these specifications based on your project requirements.

Available Sizes & Delivery

ShunFu Metal offers highly flexible production sizing for 4150 alloy steel, supplying forged and hot-rolled round bars from 80 mm to 600 mm in diameter, with lengths ranging from 1000 mm to 9000 mm. By leveraging our high-tonnage forging presses, we ensure a high forging ratio and fine grain structure. We also process these into precision hollow bars using our advanced BTA boring and CNC machining centers.

Delivery & Minimum Order Quantity (MOQ)

  • Ready Stock: Common sizes available in our 20,000 sq.m warehouse for immediate dispatch, starting at a 1-piece MOQ with a delivery time of approximately 7 days.
  • Custom Forged/Rolled Bars: Standard MOQ is 3 tons, with a lead time of around 30 days.
  • Small Batch Special Melts: Utilizing our specialized induction furnaces, we can accommodate custom chemistry melts starting at just 3–5 tons.
  • Large Volume Orders: Supported by our 30–60 ton Electric Arc Furnaces (EAF) for rapid, high-capacity fulfillment.

Chemical Composition

Chemical Composition of 4150 Alloy Steel (ASTM A29)
GradeCSiMnPSCrMo
41500.48 - 0.530.15 - 0.350.75 - 1.00≤ 0.035≤ 0.0400.80 - 1.100.15 - 0.25

ShunFu Metal conducts rigorous in-house spectrometry before and after tapping to verify that every melt strictly adheres to the specified chemical composition, and we can fine-tune specific elemental ranges to meet your exact mechanical performance requirements.

Melting & Processing

ShunFu Metal offers customized melting routes:

  • Standard: EAF + LF + VD for excellent baseline purity.
  • Higher Requirements: ESR or PESR for superior structural homogeneity.
  • Critical Applications: VIM + VAR for aerospace-grade cleanliness.

Customers can negotiate the most appropriate and cost-effective melting strategy directly with our metallurgical engineering team.

Mechanical Properties

Mechanical Properties of Quenched & Tempered 4150 Steel (Typical Values)
Diameter (d) / Thickness (t) Yield Strength (MPa) Tensile Strength (MPa) Elongation (%) Reduction of Area (%) Impact (J) Hardness (HB)
d ≤ 16 / t < 8≥ 9001100 - 1300≥ 9≥ 40-331 - 380
d: 16-40 / t: 8-20≥ 7801000 - 1200≥ 10≥ 45≥ 30298 - 359
d: 40-100 / t: 20-60≥ 700900 - 1100≥ 12≥ 50≥ 30271 - 331
d: 100-160 / t: 60-100≥ 650850 - 1000≥ 13≥ 50≥ 30253 - 298
d: 160-250 / t: 100-160≥ 550800 - 950≥ 13≥ 50≥ 30240 - 286

Prior to delivery, ShunFu Metal issues comprehensive mechanical property test reports from our fully equipped, accredited metal laboratory, with all data fully traceable to the specific heat and batch number.

Heat Treatment

Heat Treatment Parameters for 4150 Alloy Steel
Treatment TypeTemperature (°C)Process Details & Cooling Method
Soft Annealing680 - 720Heat uniformly, hold until thoroughly heated, cool slowly in furnace (Max 248 HB).
Normalizing840 - 860Heat uniformly, cool in air.
Hardening820 - 860Heat uniformly, quench in oil.
Tempering540 - 680Heat uniformly, cool in air.

Reference Hardness After Specific Heat Treatments:

  • Annealed at 815°C: 197 HB
  • Normalized at 870°C: 321 HB
  • Oil quenched, fine grained, tempered at 205°C: 530 HB
  • Oil quenched, fine grained, tempered at 315°C: 495 HB
  • Oil quenched, fine grained, tempered at 425°C: 440 HB
  • Oil quenched, fine grained, tempered at 540°C: 370 HB
  • Oil quenched, fine grained, tempered at 650°C: 290 HB

ShunFu Metal’s in-house heat treatment facility features furnaces that are regularly calibrated in strict accordance with API standards, ensuring absolute temperature uniformity and process repeatability for every 4150 steel component we process.

Surface Finish & Machining

ShunFu Metal provides comprehensive surface finishing and machining services tailored to your final product. Depending on the application, we supply 4150 steel with a Black Surface, Peeled/Turned finish, or Ground/Polished finish for high-precision dimensional tolerances. Leveraging our 45 advanced cutting machines and 6-axis CNC centers, we perform precision turning, milling, and BTA deep hole boring directly at our factory. We also offer roller burnishing and shot peening to enhance surface integrity. This factory-direct machining capability allows us to deliver tight Ra surface roughness values and exact dimensional tolerances, significantly reducing your downstream machining costs.

Quality Assurance & Inspection

Quality is engineered into every step at ShunFu Metal. Our API Q1 and ISO 9001 certified quality control process includes rigorous pre-production, in-process, and final inspections. Every batch of 4150 steel undergoes 100% Ultrasonic Testing (UT), chemical analysis, and mechanical property verification. Crucially, we perform strict 4-quadrant hardness testing and detailed metallographic inspections to guarantee uniform grain structure and hardenability. This certified oversight means our oilfield clients receive uncompromising material integrity. We provide EN 10204 3.1 certification as standard (3.2 negotiable) and routinely accommodate third-party inspections from agencies like SGS and TÜV.

Packing & Shipping

For black surface products, we utilize heavy-duty steel wire bundling to ensure structural stability during transit. Precision-machined and bright-finished 4150 parts receive multi-layer protection (nylon/canvas/wooden casing) and are coated with premium anti-rust oil to prevent corrosion during ocean freight. With experience exporting to over 52 countries, ShunFu Metal seamlessly adapts to any specific destination port packaging and documentation requirements.

Frequently Asked Questions

Can ShunFu Metal supply 4150 alloy steel to strict ASTM specifications?
Yes. ShunFu Metal strictly adheres to ASTM A29 and ASTM A322 standards. Our API Q1 and ISO 9001 certified facility utilizes in-house spectrometry and accredited mechanical testing to ensure every bar meets or exceeds these specifications, backed by an EN 10204 3.1 Mill Test Certificate.
What is the minimum order quantity for custom forged 4150 round bars?
For custom forged or rolled 4150 bars, our standard MOQ is 3 tons with a lead time of approximately 30 days. However, because ShunFu Metal operates flexible melting equipment, including small-capacity induction furnaces, we can accommodate special custom melts starting at just 3–5 tons.
Does ShunFu Metal provide pre-machined 4150 parts for oilfield applications?
Absolutely. ShunFu Metal is not just a material supplier; we are a fully integrated manufacturer. We utilize our in-house CNC lathes, milling machines, and BTA deep hole drilling equipment to supply pre-machined components like drill collar blanks and valve bodies, saving you significant downstream processing time.
What melt routes do you offer for critical high-pressure applications?
Beyond standard EAF+LF+VD, we provide ESR, PESR, and VIM+VAR remelting processes to achieve superior cleanliness and structural homogeneity for the most demanding sour-service or high-pressure oilfield environments.
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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