AMAGNIT 601 non-magnetic steel is a premium chromium manganese low carbon alloy engineered for the most demanding downhole environments. Utilizing advanced VOD process austenitic steel manufacturing combined with a proprietary rotary hammer warm forging technology, this material achieves a highly stable, ferrite-free austenitic structure. As a highly reliable stress corrosion cracking resistant steel, it delivers exceptional performance where structural integrity and operational safety are paramount.

AMAGNIT 601 non-magnetic steel round bar for downhole drilling tools
GradeAMAGNIT 601 Non-Magnetic
Alloy familyNon-magnetic austenitic

AMAGNIT 601 Non-Magnetic Steel Overview

The core Amagnit 601 alloy steel properties include high mechanical strength, consistent low magnetic permeability austenitic steel characteristics (µ max 1.010), and an inherent non-galling tendency, ensuring seamless operation in magnetic-sensitive drilling applications. Standard supply features Amagnit 601 peeled drilled round bars, precision-prepared for immediate integration into drill string components. For projects requiring elevated metallurgical cleanliness, ESR remelted Amagnit 601 steel is available to further enhance homogeneity and performance reliability.

  • MWD and LWD housings requiring precise dimensional tolerance
  • Compressive service drill pipes (flex collars) for enhanced flexibility
  • Stabilizers and heavy-weight drill pipe subs
  • Downhole tools operating in aggressive chloride-rich environments
  • Mining and rock drilling components requiring high impact toughness and non-magnetic properties

API

Compliant with API specifications for drill string components and non-magnetic collars.

ASTM A 370

Standard for mechanical testing of steel products, verifying yield, tensile, and elongation properties.

ASTM A 262 Practice E

Standard for detecting intergranular corrosion in austenitic stainless steels, ensuring SCC resistance.

ASTM G 36 / G 38

Standards for stress corrosion cracking testing in chloride environments, critical for downhole integrity.

Ready Stock

Common sizes available for immediate shipment, single-piece MOQ, ~7-day delivery.

Custom Forgings / Rolled Bars

MOQ typically 3 tons, ~30-day delivery.

Small Batch Special Grades

Meltable from 3-5 tons using our small induction furnace.

Large Volume Orders

Fast delivery via 30-60 ton Electric Arc Furnaces.

Element Content
C 0.05 max
Mn 18 – 22
Cr 6.5 – 19.5
Mo 1 max
Ni 2 max
N2 0.45 – 0.80
OD Range Min Yield Strength Min Tensile Strength Min Elongation Min Reduction of Area Surface Hardness
Up to 9 1/4″ 140,000 Psi 150,000 Psi 20% 50% 300 HB min
Above 9 1/4″ 130,000 Psi 150,000 Psi 20% 50% 300 HB min
Process Type Description / Parameters
Rotary Hammer Warm Forging Proprietary temperature/time cycle combined with chemical analysis to ensure structural stability
Solution Annealing Applied to achieve fully austenitic, ferrite-free structure and optimize mechanical properties
Compressive Layer Treatment Stress compressive layer applied to the bore of collars to increase resistance to SCC

Applications in Directional Drilling

Designed specifically for the rigorous demands of directional drilling, Oil & Gas extraction, and Mining, AMAGNIT 601 is utilized in critical downstream products. Its stable low permeability makes it the preferred choice for magnetic-sensitive tools. We supply material specifically for non-magnetic drill collars for directional and MWD drilling, ensuring accurate downhole measurements without magnetic interference.

Specifications & Standards Compliance

As a proprietary material formulated for specialized oilfield applications, AMAGNIT 601 does not directly map to a single generic ASTM or DIN material grade. However, its testing, manufacturing, and compliance align with the following industry standards, ensuring it meets stringent requirements as a top-tier non-magnetic steel.

Available Sizes & Delivery Terms

Hunan Shunfu Metal supplies AMAGNIT 601 across a versatile dimensional range to accommodate diverse downhole requirements. We provide hot-rolled round bars and forged round bars, alongside peeled and drilled hollow bars tailored for MWD/LWD housings. Our manufacturing infrastructure includes API-standard calibrated heat treatment furnaces ensuring precise metallurgical control, alongside advanced precision machining capabilities: BTA deep hole drilling, CNC lathes and milling machines, and long-distance gunhole drilling.

Chemical Composition & Mechanical Properties

The carefully balanced chemistry of AMAGNIT 601 non-magnetic steel delivers a ferrite-free austenitic structure, granting superior mechanical strength alongside extremely low magnetic permeability. The following tables detail the composition and performance metrics tested at room temperature per ASTM A 370.Magnetic Properties: Maximum Magnetic Permeability: 1.010; Average Magnetic Permeability: 1.005; Maximum Magnetic Field Gradient (hot spots): 0.05 micro-tesla / 100 mm.

Melting, Processing & Heat Treatment

Shunfu Metal offers flexible melting routes for AMAGNIT 601 to match your specific quality requirements. The conventional route utilizes an Electric Arc Furnace (EAF) followed by Ladle Furnace (LF) and Vacuum Degassing (VD) or VOD refining. For enhanced purity, ESR or PESR can be integrated. For critical applications, the VIM + VAR route is available. As a chromium manganese austenitic steel, an AOD process can also be incorporated.

Surface Finish & Machining Capabilities

Shunfu Metal provides comprehensive surface finishing and precision machining for AMAGNIT 601. Standard delivery includes peeled and drilled surfaces via turning and BTA boring. We further offer CNC milling, grinding, and long-distance gunhole drilling for complex MWD housing geometries. To enhance fatigue life and SCC resistance, roller burnishing and shot peening are available for downhole tool bores. Our machining capabilities achieve surface roughness down to Ra 1.6 µm for precision bores, with dimensional tolerances strictly controlled within ±0.05mm.

Quality Assurance & Packing

Shunfu Metal enforces rigorous quality control across pre-production, in-process, and final stages. Ultrasonic Testing (UT) verifies internal soundness. We conduct comprehensive chemical composition analysis, mechanical property testing (ASTM A 370), dimensional verification, and metallographic inspection. Corrosion resistance is validated through intergranular attack testing (ASTM A 262 Practice E) and SCC evaluations (ASTM G 36 / G 38). Material certification is provided under EN 10204 3.1, with 3.2 certificates available upon request. Third-party inspections by SGS or TÜV can be arranged. All processes operate under our API Q1 and ISO 9001 certified quality management systems.Packing protocols are tailored to product finish. Black skin forged bars are securely wire-tied and blocked to prevent container damage. For bright surfaces and precision-machined components, multiple packaging materials—including wooden crates and shock-absorbing wraps—are utilized to preserve surface roughness and dimensional tolerances. Anti-rust measures, including specialized oil coatings, guarantee zero oxidation throughout maritime shipping.

Procure AMAGNIT 601 for Your Downhole Project

Secure the structural integrity and magnetic accuracy of your drilling operations with AMAGNIT 601 non-magnetic steel from Shunfu Metal. Whether you require ready-stock peeled drilled bars or custom ESR remelted forgings, our API Q1 certified manufacturing ensures uncompromising quality.

Frequently Asked Questions

Can you supply AMAGNIT 601 to API specification?

Yes. As an API Q1 and ISO 9001 certified manufacturer, Shunfu Metal produces AMAGNIT 601 fully compliant with API specifications for non-magnetic drill collars and downhole tools.

What is the minimum order quantity for AMAGNIT 601?

For ready stock of peeled and drilled round bars, we support a single-piece MOQ with a ~7-day lead time. For custom forgings, the MOQ is typically 3 tons. Small induction furnaces accommodate 3-5 ton batches for specific melting requirements.

Is ESR remelted AMAGNIT 601 steel available?

Absolutely. While standard AMAGNIT 601 is produced via EAF + VOD, we offer ESR remelted AMAGNIT 601 steel for clients requiring superior microstructural cleanliness and enhanced mechanical consistency for critical MWD/LWD housings.

How do you verify the low magnetic permeability austenitic steel properties?

Each bar is certified at delivery for magnetic permeability (Max: 1.010, Avg: 1.005) and tested for magnetic field gradients to detect any hot spots. The stable austenitic structure ensures these non-magnetic properties remain constant throughout the product’s operational lifetime.

Need AMAGNIT 601 Non-Magnetic Steel to the specification above?

Send the size, condition, quantity and any NACE or PMI requirements — we reply with mill availability, lead time and a priced offer, usually within one working day.

Request a quotationWhatsApp +86 178 7358 1838