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Home Products M30NW-1.4472-UNS S31675-X4CrNiMnMo21-9-4

M30NW-1.4472-UNS S31675-X4CrNiMnMo21-9-4

AISI M30NW (UNS S31675) is a high-nitrogen, ultra-high-cleanliness medical-grade austenitic stainless steel, offering higher strength, superior corrosion resistance, and excellent biocompatibility. This material is produced through vacuum melting and secondary remelting processes, resulting in extremely low internal inclusion levels, making it suitable for long-term implant-grade medical applications.
The material maintains stable performance even under high-stress and highly corrosive environments, making it one of the important material choices for high-end orthopedic and dental implant instruments.

ASTM F1586：
Standard Specification for Wrought Nitrogen Strengthened 21Chromium—10Nickel—3Manganese—2.5Molybdenum Stainless Steel Alloy Bar for Surgical Implants (UNS S31675)
ISO 5832-9：
Implants for surgery — Metallic materials — Part 9: Wrought high nitrogen stainless steel

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Chemical Composition

Element	C	Mn	P	S	Si	Cr	Ni	Mo	N	Nb	Cu	Fe
Content (%)	≤0.08	2.00-4.25	≤0.025	≤0.01	≤0.75	19.50-22.00	9.00-11.00	2.00-3.00	0.25-0.50	0.25-0.80	≤0.25	balance

Mechanical Properties

Condition	Diameter or thickness（mm）	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation（4D）	Reduction of Area（%）	Hardness (HRB)
Annealed	≤ 80	≥740	≥430	35	/	/
Medium Hard	≤ 20	≥1000	≥700	20	/	/
Hard	≤ 20	≥1000	≥1000	10	/	/

Supply Forms

Available Form	Size Range	Surface Finish	Length (Customizable)	Tolerance (Customizable)	Delivery Condition
Plate	T0.5-T200.0mm	Milled	L:200/250/300W:200/300/500/1000	-0.0/+1.0mm	Annealed
Bar	φ1.0-φ200.0mm	Ground / Precision Ground	3M/PCS	h6-h9	Annealed
Wire	φ1.0-φ3.0mm	Ground / Precision Ground	1M/PCS	h6-h9	Annealed

Datasheet

Additional Info

A Brief History of AISI M30NW Stainless Steel

AISI M30NW stainless steel, also known as 1.4472, UNS S31675 or X4CrNiMnMo21-9-4, is a high-nitrogen, molybdenum-containing austenitic stainless steel for medical applications.

M30NW falls within the category of high-nitrogen austenitic stainless steels for medical use. It is a material developed from traditional medical-grade stainless steel, with a focus on higher strength, improved corrosion resistance and more consistent material quality.

Compared to traditional 316-series medical-grade austenitic stainless steel, M30NW is not merely a simple adjustment of composition; rather, it enhances the material’s overall performance in implant-related and high-demand medical applications through high-nitrogen strengthening, a molybdenum-containing corrosion-resistant design and stricter smelting controls.

M30NW is not a material that achieves high hardness through heat treatment. Its material characteristics primarily derive from its high-nitrogen austenitic microstructure, molybdenum-enhanced corrosion resistance, controlled alloy composition, and stricter quality management requirements.

How was the AISI M30NW developed

The development of AISI M30NW stemmed from the demand for higher strength and improved corrosion resistance in medical-grade stainless steel.

Early medical-grade stainless steels were primarily based on the 316 series of austenitic stainless steels. These materials possess good corrosion resistance, ductility and workability, making them suitable for a wide range of medical metal components.

With the development of orthopaedic, trauma fixation and implant-related products, material requirements have become increasingly stringent. In addition to corrosion resistance, materials now require higher strength, improved resistance to pitting corrosion, a more stable microstructure, and more reliable batch consistency.

Against this backdrop, the field of medical-grade stainless steel gradually evolved towards high-nitrogen austenitic stainless steel. Nitrogen can strengthen the austenitic microstructure, enhancing material strength whilst also helping to improve resistance to pitting corrosion. Compared to relying solely on cold working to increase strength, a high-nitrogen design can improve the material’s overall performance whilst maintaining ductility and corrosion resistance.

M30NW is a material developed in line with this approach. It utilises a higher nitrogen content to enhance strength and microstructural stability, employs molybdenum to improve corrosion resistance in chloride-containing environments, and employs stricter control over alloy composition and smelting processes to enhance material stability.

For implant-related materials, composition design is merely the foundation. The material also requires high purity, consistent batch quality and comprehensive traceability documentation.

Early Applications of AISI M30NW

AISI M30NW was initially used primarily in surgical implants and high-performance medical metal components.

Common early applications included orthopaedic implants, trauma fixation devices, bone plates, bone screws, intramedullary nails, K-wires, surgical guide wires, as well as medical bars and wires used for machining implant-related components.

These applications place high demands on material strength, corrosion resistance, fatigue performance, cleanliness and batch traceability. Due to its high nitrogen strengthening and good corrosion resistance, M30NW has gradually become one of the key material choices among high-nitrogen stainless steels for medical applications.

Current Applications of AISI M30NW

AISI M30NW is currently primarily used in medical and implant-related fields, being suitable for components with high requirements for strength, corrosion resistance, material cleanliness and traceability.

Common applications include:

Orthopaedic applications: orthopaedic implants, trauma fixation devices, bone plates, bone screws, intramedullary nails, K-wires, orthopaedic guide wires, fixation pins and other orthopaedic metal components. Such projects typically require validation in accordance with ASTM F1586, ISO 5832-9, drawing specifications, inspection documentation and end-use requirements.

Dental and orthodontic applications: Dental wire, orthodontic wire, dental fixation components, small metal components for dental prosthetics, and precision dental parts with high requirements for surface quality and corrosion resistance.

Medical devices and precision medical components: Surgical instrument parts, precision medical shafts, guide components, elastic components, micro-parts, high-purity medical metal components, and medical parts requiring stable machining performance and good surface quality.

M30NW is not typically the material of choice for high-hardness wear-resistant components or parts requiring heat treatment for strengthening. For implant-related projects, further verification should be carried out in accordance with applicable standards, test reports, drawing specifications and regulatory requirements.

Sunxin’s AISI M30NW Stainless Steel Supply Support

Sunxin supplies AISI M30NW stainless steel in sheet, bar and wire forms, as well as custom cut sizes.

Available specifications include: sheet T0.5–T200.0 mm; bar Φ1.0–Φ200.0 mm; wire Φ1.0–Φ3.0 mm. Surface finishes include milled, polished or precision-polished; tolerance options of h6–h9 for bars and wire can be confirmed according to project requirements.

Prior to the production of AISI M30NW items, it is recommended to confirm the material form, delivery condition, cold-worked condition, surface finish, dimensions, tolerances, applicable standards, inspection items and quality documentation.

Sunxin is certified to the ISO 13485 and ISO 9001 quality management systems and can support batch management, traceability control, inspection coordination and quality documentation management.

For orthopaedic implants, trauma fixation devices, bone screws, bone plates, K-wires, medical guide wires, dental and orthodontic components, medical bars, medical wires and high-purity medical metal parts, Sunxin can assist in confirming the appropriate material form, delivery condition and inspection documentation in accordance with project requirements.

FAQs

Product FAQs

Are M30NW, 1.4472 and UNS S31675 the same material?

Yes. M30NW, 1.4472, UNS S31675 and X4CrNiMnMo21-9-4 generally refer to the same high-nitrogen austenitic stainless steel. The different names stem from different standards or naming systems.

What is M30NW stainless steel?

M30NW is a high-nitrogen, molybdenum-containing austenitic stainless steel with high strength and good corrosion resistance, commonly used in medical devices and implant-related components.

What is the difference between M30NW and 316LVM?

M30NW has a higher nitrogen content and typically offers greater strength than 316LVM, whilst maintaining good corrosion resistance. 316LVM is a common low-carbon vacuum-melted stainless steel for medical use; M30NW is more suitable for applications requiring higher strength and corrosion resistance stability.

Is M30NW suitable for implant applications?

M30NW is frequently used in implant-related applications; however, suitability for specific implant products must be confirmed in accordance with ASTM F1586, ISO 5832-9, drawings and regulatory requirements. It is not recommended to determine implant suitability based solely on the material grade.

Is M30NW high-strength?

Yes. M30NW is designed with a high-nitrogen alloy to enhance strength; its tensile strength in the annealed condition is typically higher than that of standard 316L and 316LVM. Please refer to the specifications table on the product page for specific data.

Does M30NW have good corrosion resistance?

Yes. M30NW offers excellent corrosion resistance and is suitable for medical components, precision parts and implant-related components where strength, corrosion resistance stability and material cleanliness are all required.

Does M30NW rust?

It is possible. Whilst M30NW offers excellent corrosion resistance, it is not entirely rust-proof. Rust spots, pitting or surface discolouration may still occur if the surface is contaminated, contains machining residues, is cleaned improperly, or is used in an unsuitable environment.

Can the hardness of M30NW be increased through heat treatment?

Hardness cannot be significantly increased through conventional heat treatment. M30NW is an austenitic stainless steel, and its strength is primarily determined by its chemical composition and cold-worked condition.

Is M30NW easy to machine?

M30NW is suitable for machining and precision machining; however, due to its higher strength, it is generally more difficult to machine than standard 304 or 316 stainless steel. Careful attention must be paid to cutting tools, machining parameters, cooling methods and the condition of the material during machining.

What should be considered when purchasing M30NW?

When purchasing M30NW, particular attention should be paid to confirming the material standard, product form, dimensions, tolerances, surface finish, delivery condition, mechanical properties, testing requirements and batch traceability requirements.

In what forms is M30NW available?

Sunxin supplies M30NW stainless steel in sheet, bar and wire forms. Specific dimensions, tolerances, surface finishes and delivery conditions can be confirmed according to application requirements.

Can a material certificate be provided for M30NW?

Yes. M30NW projects typically require a material certificate, batch traceability, chemical composition, mechanical properties and relevant test reports. Sunxin is certified to ISO 13485 and ISO 9001 and can support batch traceability and test report management.

Typical Applications

Medical

Orthopedic implants / Trauma fixation parts / Bone screws / Bone plates / Dental instruments / Orthodontic parts

Aerospace

Corrosion-resistant elastic parts / Precision fasteners / Instrument components / Small structural parts for special environments

Industrial

High-corrosion-resistant shafts / Springs / Valve parts / Chemical equipment fasteners

Mechanical engineering

Medical robot instrument parts / Corrosion-resistant micro shafts / Elastic gripping parts / Precision connectors

Quality Services

ERP system management, full process traceability, and good batch stability.

Furnace numbering management ensures good material consistency.

Supports third-party testing and provides reports.

Chemical composition analysis (spectrometer analysis/oxygen, nitrogen, and hydrogen analyzer)

Mechanical properties (electronic tensile testing machine/Rockwell & Vickers hardness tester/impact testing machine)

Flaw detection (UT flaw detection)

Tissue examination (metallurgical microscope/electron microscope)

Heat treatment verification

Explore Quality Services

Manufacturing services

Precision Tolerance Control

Tolerances customized (H6-H9 grade)

Cut-to-Size Service

Length and width customized (0.1M-3M or slit/cut to order)

CNC Pre-Machining

chamfering/face treatment/grinding/turning/milling

Custom Dimensions Available

Custom sizes available (any non-standard dimensions can be customized)

Dimensional and Precision Control

straightness/roundness/coaxiality/dimensional tolerance records

Customized Heat Treatment

providing heat treatment based on material properties to achieve the desired delivery condition

Surface Control

roughness/fine grinding/film application on substrate

Marking and Coding Services

laser marking/inkjet coding

Shipping Packaging

Custom Size/Separate Boxes/Long-Distance Transportation

Explore Manufacturing Services

Engineering and Technical Support Services

Explore Engineering Support

Support for medical industry applications

Supports OEM/OEM drawing processing

Material selection and alternative solutions

Tool Selection

Customized heat treatment solutions

Cost optimization

Industry-supporting resource consulting

Business & Supply Chain Services

Free samples, rapid verification

Comprehensive Product Range:We offer a wide range of products and can quickly provide samples that meet your requirements. Free trials are also available depending on your needs.

Supports small batch production and flexible MOQ

Our comprehensive product range is in stock, which can support small-batch sampling and increase flexibility.

24-Hour Quotation Response

An excellent sales and technical support team is available to provide you with dedicated service 24 hours a day.

Stable Supply Chain Production System

Stable raw material sources ensure batch consistency control. Safety stock is maintained, and production is managed according to ISO 13485 and ISO 9001 standards.