Professional Customization S30300/1.4305 Alloy Stainless Steel Sheet for Orthopedic Implants 303 Steel Plate Medical Materials

Product Description

Product Description

Introduction

The machineable nature of Grade 303 stainless steel is due to the presence of Sulphur in the steels composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of grade 303 stainless steel is lower than that for 304. The toughness is still excellent as with other austenitic grades.

Composition

 Chemical composition for stainless steels alloy 303

%	303
C	0-0.10
Mn	0-2.0
Si	0-1.0
P	0-0.4
S	0-0.15
Cr	17-19
Ni	8-10
Fe	balance

 

Grade Specification

Grade	UNS	DIN	EN	AMS	ASTM		BS
303	S30300	-	1.4305				303S31

Mechanical Properties

Mechanical properties for stainless steel alloy 303 bar

Grade	303
Tensile Strength (MPa)	500-750 MPa
Proof Stress (MPa)	190 Min MPa
Elongation A5 mm	35 Min %
Hardness Brinell	230 Max HB

 

Physical Properties

Physical properties for stainless steel alloy 303

Property	Value
Density	8.03 kg/m^3
Melting Point	1455°C
Modulus of Elasticity	193 GPa
Electrical Resistivity	0.72 x 10^-6 Ω.m
Thermal Conductivity	16.3 W/m.K
Thermal Expansion	17.3 x 10^-6/K

Characteristic

Corrosion Resistance

Sulphur additions to the composition act as initiation sites for pitting corrosion. This decreases the corrosion resistance of grade 303 stainless steel to less than that for 304. However corrosion resistance remains good in mild environments.

In chloride containing environments over 60°C, grade 303 stainless steel is subject to pitting and crevice corrosion. Grade 303 stainless is not suitable for use in marine environments.

Heat Resistance

Grade 303 stainless steel has good resistance to oxidation when intermittently exposed to temperature up to 760°C temperatures. It also has good oxidation resistance in continuous service to 870°C. This, however, is not recommended as 303 is sensitive to carbide precipitation with continuous use at 425-860°C.

Cold Working

Type 303 is not readily cold workable. Some cold working is possible but sharp bending should not be attempted.

Hot Working

Fabrication methods, like forging, that involve hot working like should occur after uniform heating to 1149-1260°C. The fabricated components should then be rapidly cooled to ensure maximum corrosion resistance.

Heat Treatment

Grade 303 stainless steel cannot be hardened by heat treatment.

Solution treatment or annealing can be done by rapid cooling after heating to 1010-1120°C.

Machinability

Grade 303 stainless steel has excellent machinability. Machining can be enhanced by adhering to the following rules:

• Cutting edges must be kept sharp. Dull edges cause excess work hardening.
• Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material.
• Chip breakers should be employed to assist in ensuring swarf remains clear of the work
• Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.

Welding

The sulphur addition present in Grade 303 stainless steel results in poor weldability. If Grade 303 stainless steel must be welded the recommended filler rods or electrodes are grades 308L and 309 stainless steels. For maximum corrosion resistance, the welds must be annealed.

Applications

The application of 303 stainless steel in the medical field mainly includes the manufacture of surgical instruments, medical equipment and implants. 303 stainless steel has good biocompatibility and corrosion resistance, which can ensure good compatibility with the biological environment, so it is widely used in the medical field. Specific applications include:

Surgical instruments: 303 stainless steel is used to manufacture surgical instruments such as blades, scissors, pliers, etc., which can work stably during surgery due to its corrosion resistance and good mechanical properties.

Medical equipment: In the manufacture of medical equipment, 303 stainless steel is used to manufacture the outer shell and internal structure of various medical devices to ensure the corrosion resistance and long-term stability of the equipment.

Implants: Due to its biocompatibility, 303 stainless steel is also used to manufacture orthopedic implants, heart valves, etc., to help patients recover after surgery.

These applications not only demonstrate the diversity and importance of 303 stainless steel in the medical field, but also reflect its superiority in corrosion resistance, biocompatibility and mechanical properties.

 

Surface Treatment

 

Process

Main Applications

 

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