Medical stainless steel has been widely used as medical implant material and medical tool material because of its good biocompatibility, good mechanical properties, and excellent corrosion resistance of body fluids and good processability. Medical stainless steel is widely used to make various artificial joint and fracture internal fixation instruments, such as all kinds of artificial hip, knee, shoulder, elbow joint; In dentistry, it is widely used in dental dentistry, dental orthotics, dental root implantation; In cardiac surgery, it is used in cardiovascular stent. In addition to making a variety of surgical implants, medical stainless steel is also used for producing a variety of medical surgical instruments or tools, like surgical sutures. Different grade steel brings the different performance on sutures needles, but all these can meet the lowest requirement of safe surgery. Following chart lists medical stainless steel which mostly to be used in surgical sutures needles. | Element Material | C | Si | Mn | P | S | Ni | Cr | N | Cu | Mo | Fe | Al | B | Ti | Cb |
| 420J2 | 0.28 | 0.366 | 0.440 | 0.0269 | 0.0022 | 0.363 | 13.347 | / | / | / | Balance | / | / | / | / |
| 455 | 0.05 | 0.5 | 0.5 | 0.04 | 0.03 | 7.5-9.5 | 11.0-12.5 | / | 1.5-2.5 | 0.5 | 71.98-77.48 | / | / | 0.8-1.4 | 0.1-0.5 |
| 470 | 0.01 | 0.040 | 0.020 | 0.0020 | 0.0230 | 11.040 | 11.540 | 0.004 | 0.010 | 0.960 | Balance | 0.090 | 0.0022 | 1.600 | 0.01 |
| 302 | ≤0.15 | ≤1.0 | ≤2.0 | ≤0.045 | ≤0.03 | 8.0-10.0 | 17.0-19.0 | / | / | / | Balance | / | / | / | / |
| 304AISI | ≤0.07 | ≤1.0 | ≤2.0 | ≤0.045 | ≤0.015 | 8.0 -10.5 | 17.5-19.5 | ≤0.11 | / | / | Balance | / | / | / | / |