Choosing stainless for medical devices: 316L, 17-4PH and 420

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medical · 316L · 17-4PH · selection

316L suits general instruments and implant aids, 17-4PH high-strength instruments, 420 cutting edges. Cleanability, sterilisation and biocompatibility drive the choice.

Medical stainless selection centres on corrosion resistance, strength, cleanability and sterilisation:

• 316L (1.4404): good corrosion resistance and biocompatibility; used for instrument handles, frames, implant aids and stainless tubing; inclusion content and surface quality matter.
• 17-4PH (630): precipitation hardening, tensile strength above 1000 MPa; used for orthopaedic instruments and high-strength parts; apply in the specified condition (H900/H1025).
• 420/440C martensitic: high hardness for scalpel blades and scissors; lower corrosion resistance, so rust management is essential.

Key requirements:

1) Cleaning and sterilisation: repeated autoclave cycles require stable material and cleanable surfaces.
2) Surface quality: lower Ra reduces bacterial retention; mirror polishing and passivation are key.
3) Biocompatibility: body-contact parts assessed per ISO 10993.
4) Traceability: heat numbers, material certificates and process records.

Purchasing reminder: do not stop at the grade — specify surface roughness, passivation and cleanliness; medical suppliers usually need ISO 13485.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。

Choosing stainless for medical devices: 316L, 17-4PH and 420

316L suits general instruments and implant aids, 17-4PH high-strength instruments, 420 cutting edges. Cleanability, sterilisation and biocompatibility drive the choice.

Medical stainless selection centres on corrosion resistance, strength, cleanability and sterilisation:

• 316L (1.4404): good corrosion resistance and biocompatibility; used for instrument handles, frames, implant aids and stainless tubing; inclusion content and surface quality matter.
• 17-4PH (630): precipitation hardening, tensile strength above 1000 MPa; used for orthopaedic instruments and high-strength parts; apply in the specified condition (H900/H1025).
• 420/440C martensitic: high hardness for scalpel blades and scissors; lower corrosion resistance, so rust management is essential.

Key requirements:

1) Cleaning and sterilisation: repeated autoclave cycles require stable material and cleanable surfaces.
2) Surface quality: lower Ra reduces bacterial retention; mirror polishing and passivation are key.
3) Biocompatibility: body-contact parts assessed per ISO 10993.
4) Traceability: heat numbers, material certificates and process records.

Purchasing reminder: do not stop at the grade — specify surface roughness, passivation and cleanliness; medical suppliers usually need ISO 13485.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。