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AISI 4137H Hollow Bar

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AISI 4137H Hollow Bar2026-04-29T03:57:21+00:00

AISI 4137H Hollow Bar

AISI 4137H Hollow Bar chromium-molybdenum alloy steel round bar for drill collar blanks and oilfield drilling applications
AISI 4137H Hollow Bar — ShunFu Metal

The AISI 4137H Hollow Bar is a premium Cr-Mo alloy steel renowned for exceptional hardenability, uniform strength, and superior fatigue resistance. As a dedicated manufacturer for the global oil, gas, and mining sectors, ShunFu Metal focuses on producing this critical grade to withstand severe downhole environments.

Backed by our API Q1 and ISO 9001 certifications, we currently supply top-tier AISI 4137H materials to the world's top 10 oilfield service companies. Our extensive export experience and in-house metallurgical control ensure that every hollow bar we deliver meets the rigorous mechanical demands of modern drilling operations.

Equivalent Grades

UNS
G41370
SAE / AISI
4137H
DIN
1.7225 (Approximate equivalent, 42CrMo4)
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Applications

Drill Collar Blanks
Supplied as precision-machined AISI 4137H Hollow Bar, utilizing our in-house BTA deep hole drilling equipment to guarantee perfect concentricity and straightness for directional drilling. Explore our drill collar product range.
Tool Joints
Delivered as forged round bars or pre-machined hollows, fully heat-treated in ShunFu Metal's API-calibrated furnaces to achieve the optimal yield strength required for heavy-duty drill string connections.
Heavy-Weight Drill Pipe (HWDP) Components
Provided in custom-bored hollow bar formats, delivered ready for final threading and friction welding by our oilfield customers. See our drill pipe offerings for complementary solutions.
Valve Body Forgings
Supplied as raw or rough-machined forgings, utilizing ShunFu Metal's high-forging-ratio capabilities to ensure a fine, uniform grain structure that resists high-pressure fluid environments.

Specifications & Standards

  • ASTM A304: Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements
  • API Spec 7-1: Specification for Rotary Drill Stem Elements
  • SAE J1268: Hardenability Bands for Carbon and Alloy Steels

ShunFu Metal strictly organizes production according to the above standards and can issue corresponding material test certificates based on your specific project requirements. For corrosion-resistant applications, we also reference NACE MR0175 / ISO 15156 guidelines.

Available Sizes & Delivery

ShunFu Metal offers highly flexible production for the AISI 4137H Hollow Bar and related profiles. We supply rolled and forged round bars, flat bars, and precision-bored hollow bars. Our advanced forging capabilities guarantee a high forging ratio and excellent grain structure. Combined with our API-calibrated heat treatment furnaces and precision machining equipment—including BTA boring, CNC lathes, and long-distance gunhole drilling—we deliver exact dimensions tailored to your drawings.

Delivery & MOQ

  • Ready Stock: Available for common grades, MOQ from 1 piece, delivery in approximately 7 days.
  • Custom Forged / Rolled: Standard MOQ is 3 tons, with a 30-day delivery time.
  • Small Batch Special Melts: Our small induction furnaces allow custom melting starting at just 3–5 tons.
  • Large Batch Orders: Efficiently processed via our 30–60 ton EAF route for rapid delivery.

Chemical Composition

ShunFu Metal strictly controls the chemical composition of every AISI 4137H Hollow Bar through in-house spectrometry and melt shop processes, ensuring all elements meet specification. We can also fine-tune the composition to match your specific mechanical requirements.

AISI 4137H Hollow Bar — Chemical Composition (wt%)
Element Content (%)
Carbon (C) 0.35 – 0.42
Manganese (Mn) 0.70 – 1.05
Silicon (Si) 0.15 – 0.35
Chromium (Cr) 0.80 – 1.15
Molybdenum (Mo) 0.15 – 0.25
Phosphorus (P) Max 0.035
Sulfur (S) Max 0.040

Melting & Processing

ShunFu Metal offers customized melting routes to match the criticality of your application. Our standard process is EAF + LF + VD. For higher purity requirements, we provide ESR or PESR. For the most critical applications where ultra-clean steel is mandatory, VIM + VAR is available. Customers can negotiate the optimal metallurgical solution with our engineering team.

Mechanical Properties

AISI 4137H Hollow Bar — Typical Mechanical Properties (Quenched & Tempered)
Property Typical Value
Tensile Strength (Rm) ≥ 980 MPa
Yield Strength (Rp0.2) ≥ 830 MPa
Elongation (A5) ≥ 13%
Hardness 285 – 341 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 of your AISI 4137H Hollow Bar.

Heat Treatment

AISI 4137H Hollow Bar — Heat Treatment Parameters
Process Temperature Range Cooling Method
Normalizing 860°C – 900°C Air Cool
Austenitizing / Quenching 840°C – 880°C Oil or Polymer Quench
Tempering 540°C – 680°C Air Cool

ShunFu Metal's heat treatment furnaces are strictly calibrated in accordance with API standards. This ensures exceptional temperature uniformity and process repeatability, guaranteeing that every AISI 4137H Hollow Bar achieves fully tempered martensite for maximum fatigue and stress resistance.

Surface Finish & Machining

ShunFu Metal provides extensive in-house precision machining for the AISI 4137H Hollow Bar. Utilizing our 45 advanced cutting machines, we offer turning, milling, and CNC finishing to exact tolerances. For internal bores, our BTA deep hole drilling and long-distance gunhole drilling achieve superior concentricity. We also provide roller burnishing and shot peening to enhance surface fatigue life. Depending on the method, we can achieve surface roughness down to Ra 0.8–1.6 µm. These direct-from-factory capabilities ensure your components are delivered ready for immediate downstream manufacturing.

Quality Assurance & Inspection

ShunFu Metal implements rigorous quality control throughout production. Our process includes 100% Ultrasonic Testing (UT), chemical analysis, mechanical testing, and precise dimensional checks. We perform specialized four-quadrant hardness testing and comprehensive metallographic examinations to verify structural integrity.

Holding API Q1 and ISO 9001 certifications means our AISI 4137H Hollow Bar production adheres to the strictest global oilfield standards. We issue EN 10204 3.1 certificates as standard, with 3.2 certification available upon request. We also routinely coordinate with third-party inspectors like SGS and TÜV. For sour-service environments, we reference BS EN ISO 15156 material compliance protocols.

Packing & Shipping

Black surface products are securely bundled with steel wire to prevent transit damage. Precision-machined AISI 4137H Hollow Bars receive heavy anti-rust oil coating and multi-layer protective packaging. Having exported to over 50 countries, ShunFu Metal seamlessly accommodates all destination port packaging and documentation requirements, including those related to casing and tubing logistics standards.

Frequently Asked Questions

Can ShunFu Metal supply the AISI 4137H Hollow Bar to API specifications?

Yes. As an API Q1 certified manufacturer, ShunFu Metal produces and tests all oilfield tubulars and hollow bars in strict accordance with API Spec 7-1 and relevant ASTM standards, ensuring full compliance for drilling applications.

What is the minimum order quantity for custom machined hollow bars?

For custom forged or rolled AISI 4137H materials, our standard MOQ is 3 tons. However, our flexible melting capabilities allow us to produce special small-batch heats starting at 3–5 tons using our in-house induction furnaces.

Can you provide deep-hole boring for this material?

Absolutely. ShunFu Metal is equipped with advanced BTA boring and long-distance gunhole drilling machines. We can supply the AISI 4137H Hollow Bar pre-drilled to your exact inner diameter and concentricity requirements, saving you significant machining time and reducing material waste.

What mechanical properties can I expect from quenched and tempered AISI 4137H?

In the quenched and tempered condition, you can expect tensile strength ≥ 980 MPa, yield strength ≥ 830 MPa, elongation ≥ 13%, and hardness in the range of 285–341 HBW. We provide full test reports traceable to your specific heat and batch before shipment.

What inspection processes are applied to every AISI 4137H Hollow Bar order?

Every batch undergoes 100% ultrasonic testing, chemical analysis via spectrometry, comprehensive mechanical testing, precise dimensional checks, and four-quadrant hardness testing. Metallographic examinations verify grain structure integrity against the specified standards.

Request a Quote for AISI 4137H Hollow Bar
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