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AISI 4145H MOD Stabilizer Forging

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AISI 4145H MOD Stabilizer Forging2026-04-29T02:50:15+00:00

Project Description

AISI 4145H MOD Stabilizer Forging

AISI 4145H MOD stabilizer forging, premium chromoly steel for oilfield drill stem components
AISI 4145H MOD stabilizer forging manufactured by ShunFu Metal

AISI 4145H MOD is a premium chromium-molybdenum alloy steel known for its exceptional hardenability, toughness, and resistance to sulfide stress corrosion cracking. As a specialized manufacturer for the global oil, gas, and mining sectors, ShunFu Metal produces these stabilizer forgings from solid, high-purity billets. Backed by our API Q1 and ISO 9001 certifications, we have accumulated rich experience supplying critical drill string components to the world’s top 10 oilfield service companies. Our in-house metallurgical control ensures every forging delivers uncompromising material integrity for the most demanding downhole environments.

Equivalent Grades

Material equivalence for AISI 4145H MOD stabilizer forging
Standard Grade / Designation
UNS G41450 (Modified)
API API SPEC 7-1 (4145H MOD)
DIN / EN 1.7228 / 50CrMo4 (Equivalent)

Applications

AISI 4145H MOD is engineered for high-stress applications in the Oil & Gas, Mining, and Drilling engineering sectors. Typical downstream products include:

  • Integral Blade Stabilizer Forgings: Supplied by ShunFu Metal as solid forged bars, heat-treated to API SPEC 7-1 standards, ready for final blade milling.
  • Drill Collar Blanks: Delivered as precision-machined hollow bars utilizing our BTA deep hole drilling capabilities for perfect concentricity.
  • Rotary Steerable System (RSS) Components: Supplied as custom-forged and CNC-turned blanks, ensuring uniform microstructures for complex directional drilling tools.
  • Heavy Weight Drill Pipe (HWDP) Tool Joints: Forged and heat-treated in our API-calibrated furnaces to guarantee high yield strength and fatigue resistance.

Specifications & Standards

  • API SPEC 7-1: Specification for Rotary Drill Stem Elements (Stabilizers, Drill Collars)
  • ASTM A29 / A29M: Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
  • ASTM A370: Standard Test Methods and Definitions for Mechanical Testing of Steel Products

ShunFu Metal strictly organizes production according to these standards and provides comprehensive Material Test Certificates (MTC) compliant with customer requirements.

Available Sizes & Delivery

ShunFu Metal offers exceptional supply flexibility. Our high-ratio forging capabilities ensure fine grain structure, while our API-calibrated furnaces and precision machining (BTA boring, CNC) guarantee exact dimensions.

Standard stabilizer forging dimensions (inches)
Crown OD (in) Neck OD (in) ID (in) Neck Length (in) Crown Length (in) Overall Length (in)
8 1/2 6 1/2 2 13/16 30 18 100
12 1/4 8 1/4 - 9 1/2 2 13/16 30 18 100
14 3/4 8 1/4 - 9 1/2 3 30 20 100
16 3/8 - 17 1/2 8 1/4 - 9 1/2 3 30 20 100
22 - 28 9 1/2 3 30 24 100 - 122
  • Ready Stock: Common grades available from 1 pc, ~7 days delivery.
  • Custom Forgings: MOQ 3 tons, ~30 days delivery.
  • Small Batches: 3–5 tons via our specialized induction furnaces.
  • Large Orders: 30–60 tons EAF routing for rapid fulfillment.

Chemical Composition

ShunFu Metal utilizes in-house spectrometry to verify the chemical composition of every single heat, ensuring all elements strictly conform to API specifications. We can also micro-adjust the alloy matrix to meet your specific performance requirements.

Chemical composition of AISI 4145H MOD (weight %)
Grade C (%) Mn (%) Si (%) Cr (%) Mo (%) P (%) S (%)
4145H MOD 0.42 - 0.49 0.65 - 1.10 0.15 - 0.35 0.75 - 1.20 0.25 - 0.35 ≤ 0.025 ≤ 0.025

Melting & Processing

ShunFu Metal offers standard EAF + LF + VD melting. For higher purity, we provide ESR or PESR, and VIM + VAR for ultimate critical applications. Customers can consult our metallurgical engineers to select the optimal, customized melting route for their specific downhole requirements.

Mechanical Properties

The following properties reflect the API SPEC 7-1 requirements for our stabilizer forgings.

Minimum mechanical properties for AISI 4145H MOD stabilizer forgings
Min. Yield Strength (psi) Min. Tensile Strength (psi) Min. Elongation (%) Brinell Hardness (HB) Min. Charpy V-Notch (Ft·lbf)
115,000 140,000 15 285 - 341 40

ShunFu Metal issues comprehensive mechanical testing reports from approved laboratories prior to delivery, with all data fully traceable to the specific heat and batch numbers.

Heat Treatment

Heat treatment process for AISI 4145H MOD
Process Temperature Range Cooling Method Objective
Austenitizing / Quenching 840°C - 870°C Water / Polymer Quench Achieve full martensitic transformation
Tempering 540°C - 680°C Air Cool Attain 285-341 HB and relieve internal stress

ShunFu Metal’s heat treatment furnaces are strictly calibrated to API standards, ensuring uniform temperature distribution and absolute process repeatability. This guarantees that our professional heat-treatment process achieves the required 285-341 HB hardness both 1” beneath the outer surface and across 4 quadrants of the neck OD.

Surface Finish & Machining

Leveraging our factory-direct precision equipment, ShunFu Metal provides extensive machining services for stabilizer forgings, including Turning, Milling, CNC precision machining, and BTA Boring. Our long-distance gunhole-drilling ensures perfect ID concentricity, while our CNC lathes achieve tight dimensional tolerances and superior surface roughness (Ra) tailored to your blueprints. By delivering semi-finished or fully machined components, we significantly reduce final machining time and costs for our global clients.

Quality Assurance & Inspection

Holding API Q1 and ISO 9001 certifications, ShunFu Metal enforces rigorous quality control. Our process includes 100% Ultrasonic Testing (UT), chemical analysis, and dimensional checks. Crucially, we perform 4-quadrant hardness testing and metallographic examinations to ensure uniform martensitic structures. This guarantees uncompromising material integrity for oilfield applications. We provide EN 10204 3.1 certificates standard, with 3.2 certification via SGS or TÜV available upon request.

Packing & Shipping

With experience exporting to over 50 countries, ShunFu Metal ensures secure transit. Black surface forgings are heavily wire-bundled. Bright or precision-machined products receive heavy anti-rust oil coating and multi-layer protective wrapping to preserve surface roughness and dimensional accuracy during long-distance ocean freight.

Frequently Asked Questions

Can ShunFu Metal supply AISI 4145H MOD stabilizer forgings strictly to API SPEC 7-1?

Yes. Our entire production process, from melting to our API-calibrated heat treatment furnaces, is designed to meet and exceed API SPEC 7-1 mechanical requirements, ensuring a minimum yield strength of 115,000 psi.

How does ShunFu Metal guarantee the hardness consistency of the stabilizer neck?

We utilize highly controlled quenching and tempering processes. Post-treatment, our quality assurance team conducts strict 4-quadrant hardness testing to assure 285-341 HB both 1” beneath the outer surface and across the neck OD.

What is the minimum order quantity (MOQ) for custom stabilizer sizes?

While we hold ready stock for common dimensions (available from 1 piece), custom forged sizes typically require an MOQ of 3 tons. Our flexible induction and EAF melting capacities allow us to efficiently handle both small custom batches and large-scale orders.

Start Your Inquiry

Contact our engineering team today for a competitive quotation on AISI 4145H MOD stabilizer forgings or custom melt-shop solutions.

Request a Quote
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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