Steel that holds a cutting edge through surgery, survives 1,000 autoclave cycles at 134 °C without rust, and forms into a 5 mm minimally invasive grasper — with hardness, corrosion resistance and biocompatibility verified per heat.
A surgical blade must be hard enough to cut tissue and tough enough not to chip. A hemostat must clamp repeatedly without breaking. A minimally invasive grasper must flex through a 5 mm port. An orthopedic drill must cut bone without dulling. Each duty demands a different steel: one that hardens to 50+ HRC and resists autoclave corrosion, one that work-hardens and stays flexible, one that wears through bone. The four families below map directly to those four duties.
C 0.36–0.45%, Cr 12–14%. The standard surgical instrument steel: hardens to 48–53 HRC (blades 50–54 HRC) and resists corrosion from blood, saline and repeated autoclaving. The chromium content forms a passive oxide layer that, after passivation treatment, survives 1,000+ sterilization cycles at 134 °C. Supplied spheroidized-annealed for blanking and machining, with controlled decarb so the cutting edge is not a soft skin.
Choose 4Cr13/SUS420J2 for every surgical blade, scissor, hemostat and cutting instrument.C ≤0.15%, Cr 16–18%, Ni 6–8%. Does not quench-harden; instead work-hardens during forming and stamping, reaching 800–1200 MPa in H/SH temper while retaining ductility for small bend radii. Used for minimally invasive instrument components — grasper jaws, dissector shafts, clip applier mechanisms — that must be thin, flexible and corrosion-resistant. Non-magnetic, important for MRI-compatible instruments.
Choose SUS301 for minimally invasive instruments, spring clips and flexible device components.C ≤0.08%, Cr 18–20%, Ni 8–10.5%. The most corrosion-resistant of the four families, with excellent formability and weldability. Used for medical device housings, instrument trays, sterilization containers and non-cutting device components where the priority is corrosion resistance and cleanability, not cutting hardness. SUS304 is the default for any medical device part that does not need a hardened edge.
Choose SUS304 for device housings, trays, containers and non-cutting components.C 0.95–1.10%, Cr 1.30–1.65%. High carbon and chromium produce hard chromium carbides that resist abrasive wear when cutting cortical bone. Through-hardens to 58–62 HRC uniformly in drill diameters 2.0–8.0 mm. Used for orthopedic drills, taps, reamers and surgical saw blades where wear resistance is the governing parameter. GCr15 is not stainless — it requires coating or passivation for corrosion protection.
Choose GCr15 for orthopedic drills, taps, reamers and high-wear surgical cutting tools.Indicative values from production surgical instrument programs; the final spec is agreed at RFQ against your instrument drawing, device class and governing standard (GB, JIS, AISI, ASTM F899, ISO 7153).
| Component | Steel grade | Section / thickness | Key parameter |
|---|---|---|---|
| Surgical blade (scalpel) | 4Cr13 | 0.10 – 0.25 mm | HRC 50–54, edge sharpness, autoclave ≥1000 cycles |
| Surgical scissors / hemostat | SUS420J2 | Bar Ø 4 – 12 mm | HRC 48–53, corrosion-resistant, passivated |
| Needle holder / forceps | 4Cr13 / SUS420J2 | Bar Ø 3 – 10 mm | HRC 46–52, jaw wear resistance, autoclavable |
| Minimally invasive grasper jaw | SUS301 H/SH | 0.20 – 0.60 mm | Tensile 800–1200 MPa, flexible, non-magnetic |
| Surgical clip / ligating clip | SUS301 H | 0.15 – 0.40 mm | Work-hardened, spring-back, corrosion-resistant |
| Device housing / tray | SUS304 | 0.40 – 2.0 mm | Corrosion-resistant, formable, weldable, cleanable |
| Orthopedic drill / tap | GCr15 | Ø 2.0 – 8.0 mm | HRC 58–62, wear-resistant, through-hardened |
| Surgical saw blade | GCr15 / 4Cr13 | 0.50 – 1.5 mm | HRC 52–58, fatigue-resistant, autoclavable |
Hardness values are after standard quenching and tempering; the exact band depends on section size and tempering temperature. Autoclave corrosion resistance requires proper passivation after all manufacturing operations. GCr15 parts require coating or oil for corrosion protection during storage. All surgical grades are supplied with chemistry confirmed per heat to the relevant standard.
All grades supplied with confirmed chemistry and hardness per heat. Choose by instrument type (cutting, grasping, structural, orthopedic), sterilization method and required corrosion resistance.
| Instrument type | Primary grade | Alternative grade | Selection criterion |
|---|---|---|---|
| Surgical scalpel blade | 4Cr13 (GB) | SUS420J2 (JIS) | HRC 50–54 + edge retention + autoclave resistance |
| Surgical scissors | SUS420J2 | 4Cr13 | HRC 48–53 + toughness + corrosion resistance |
| Hemostat / artery forceps | 4Cr13 | SUS420J2 | HRC 46–52 + jaw wear + fatigue resistance |
| Needle holder | SUS420J2 | 4Cr13 | Jaw hardness + autoclavable + passivatable |
| Minimally invasive grasper | SUS301 H/SH | SUS304 (structural) | Flexibility + strength + non-magnetic + 5 mm port |
| Surgical / ligating clip | SUS301 H | Ti alloy (permanent) | Spring-back + corrosion + temporary implant |
| Device housing / enclosure | SUS304 | SUS316L (implant-adjacent) | Corrosion resistance + formability + cleanability |
| Sterilization tray / container | SUS304 | Aluminum (anodized) | Autoclave resistance + durability + weight |
| Orthopedic drill / tap | GCr15 | M2 HSS (heavy duty) | HRC 58–62 + bone wear resistance + through-hardening |
| Orthopedic reamer / saw | GCr15 | 4Cr13 (autoclavable) | Wear resistance + fatigue + corrosion trade-off |
| Dental instrument / scaler | SUS420J2 | 4Cr13 | HRC 48–53 + corrosion + edge retention |
Grade selection for cutting instruments is driven by the required HRC band and autoclave corrosion resistance. For implant-adjacent or permanent implant components, ASTM F138 (316L) or ASTM F136 (Ti-6Al-4V ELI) govern — those are outside the scope of this page. Confirm the governing standard (GB/T 1220, JIS G4304, ASTM F899, ISO 7153-1) at RFQ.
These are the failure modes that show up in surgical instrument production, in the order instrument engineers care about them.
A surgical instrument that develops rust spots after 50–100 autoclave cycles almost always has free iron or surface contamination that was not removed by passivation. Fix: supply 4Cr13/SUS420J2 with a clean, contamination-free surface — no residual iron from grinding, no carbon steel contact during handling — so the instrument maker's passivation bath can form a complete chromium-oxide layer. We confirm surface cleanliness per batch and can supply passivation-ready strip with verified surface chemistry.
A surgical blade that chips at the edge during use is either too hard (over-tempered martensite) or has a decarburized surface that under-hardens. Fix: 4Cr13 strip with controlled decarb ≤0.03 mm per side and confirmed hardenability per heat, so the blade maker's quench-and-temper cycle lands in the 50–54 HRC band consistently. We report decarb and hardness on process samples with every MTC.
A SUS301 grasper jaw or clip that cracks during forming at a 0.3 mm bend radius has insufficient ductility for the required temper. Fix: match the SUS301 temper to the forming severity — H temper for moderate bends, 3/4H for tight bends — and confirm the strip's elongation and bendability per coil. We supply SUS301 with confirmed mechanicals and can recommend the temper that balances strength against formability for your specific geometry.
A GCr15 orthopedic drill that dulls after 20–30 bone holes has uneven carbide distribution or insufficient through-hardening in the drill flutes. Fix: GCr15 bar with confirmed carbide particle size and distribution (spheroidized carbide ≤2 μm), through-hardened to 58–62 HRC uniformly across the 2.0–8.0 mm diameter. We confirm the bar's microstructure and hardenability per heat so the drill reaches full hardness from shank to tip.
Surgical instrument production draws on several steel families. Match your instrument below and confirm at RFQ.
4Cr13 / SUS420J2 martensitic stainless for surgical blades, scissors, hemostats and needle holders at HRC 48–53 with autoclave corrosion resistance. Martensitic stainless family →
SUS301 / SUS304 austenitic stainless for minimally invasive instruments, surgical clips and device housings with work-hardened strength and corrosion resistance. Stainless steel family →
GCr15 / SUJ2 bearing steel for orthopedic drills, taps and reamers at HRC 58–62 with uniform carbide distribution and through-hardening. Bearing steel family →
SK5 / SK85 carbon tool steel for surgical saw blades and specialty cutting instruments where maximum edge hardness is required. Tool steel family →
A typical #10 surgical scalpel blade, described the way it runs.
The blade is a #10 general-purpose scalpel, 39 mm overall length, 0.18 mm thick, with a curved cutting edge ground to a 12° included angle and a #4 fitting tang. The drawing calls 4Cr13 martensitic stainless steel strip, 0.18 mm, spheroidized-annealed, decarb ≤0.03 mm per side, surface free of inclusions and seams. The strip is blanked to the blade profile in a progressive die, then the cutting edge is ground, the blade is austenitized at 1020–1050 °C, oil-quenched, and tempered at 200–250 °C to land 52–54 HRC. After hardening, the blade is electropolished to a mirror finish, passivated in citric acid, and individually packaged in a sterile peel pouch.
The autoclave corrosion test is the moment of truth. The blade is subjected to 1,000 cycles of 134 °C, 2.2 bar, 18-minute steam sterilization, then inspected for rust spots and pitting under 10× magnification. Any blade with a single rust spot fails — and the root cause is almost always surface contamination from manufacturing or incomplete passivation, not the steel chemistry. That is why the incoming 4Cr13 strip's surface cleanliness and decarb limit are not optional: they are the difference between a 99% first-pass corrosion test and a 70% pass rate with rework. Our job is to make the strip's chemistry, decarb and surface so repeatable that the blade line's variables (grinding, hardening, passivation) are the only variables left.
The same operating room uses a minimally invasive grasper with SUS301 H jaws, 0.30 mm thick, formed to a 0.5 mm bend radius and work-hardened to 900–1100 MPa tensile. The grasper must flex open and closed 10,000 times through a 5 mm trocar port without cracking or losing spring-back. And an orthopedic trauma set uses GCr15 drills, 3.2 mm and 4.5 mm diameter, hardened to 60–62 HRC, each rated for 50+ bone holes before resharpening. If your surgical program needs 4Cr13 for blades, SUS301 for minimally invasive instruments, GCr15 for orthopedic tools, or SUS304 for housings, send the drawing and we confirm grade, hardness, surface condition and a trial-coil plan. Our slitting and processing services cover exact-width coils, cut-to-length sheets and edge conditioning for blanking and grinding.
Related reading: how 4Cr13 and SUS420J2 martensitic stainless harden and resist corrosion, and how surface finish and passivation affect surgical instrument corrosion resistance. For procurement context, see our precision steel strip buyer's handbook. Related application pages: medical surgical blade steel and knife & blade steel strip.
These grade families share material, processing or application territory with the topic on this page.
4Cr13 / SUS420J2 grades with HRC 48–53 and autoclave corrosion resistance for cutting instruments.
SUS301 / SUS304 grades with work-hardened strength and corrosion resistance for flexible device components.
GCr15 / SUJ2 grades at HRC 58–62 with uniform carbide distribution for bone-cutting tools.
Send instrument drawing, section size, target HRC, sterilization method, quantity and destination port. Our engineers reply within one working day with grade match and a trial-coil option.