Alloy 316LVM, 1.4441, X2CrNiMo18-15-3, UNS S31673 according to DIN 17443 and ASTM F138
Table of content:
| Standard | Grade | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition % | ||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | N: | Comments: | |
| DIN | 1.4441 / X2CrNiMo18-15-3 | |||||||||
| <0.03 | <2.0 | <1.0 | <0.025 | <0.01 | 17.0-18.5 | 13.5-15.5 | 2.7-3.2 | <0.1 | - | |
| ASTM | AISI 316LVM / UNS S31673 | |||||||||
| <0.03 | <2.0 | <0.75 | <0.025 | <0.01 | 17.0-19.0 | 13.0-15.0 | 2.25-3.00 | <0.1 | - | |
| SANDVIK | Bioline® 316LVM | |||||||||
| <0.025 | 1.7 | 0.6 | <0.025 | <0.003 | 17.5 | 14.0 | 2.8 | <0.1 | - | |
Alloy 316LVM, 1.4441, X2CrNiMo18-15-3, UNS S31673 - description
1.4441 is a Cr-Ni-Mo high-purity steel for medical applications with exceptional resistance to physiological environments. The alloy defy most acids and comply with the ISO 5832-1 and ASTM F-138 norms for implants and medical instruments (it was first described in now inactive DIN 17443 norm).
Low carbon content mean 1.4441 do not form chromium carbide during welding, which makes any subsequent heat treatment unncessary.
Applications
1.4441 tube wires and strips are used for trauma fixation devices such as bone screws, spinal systems and compression plates. The 1.4441 bars are forged into replacement hip joints.
Alloy 316LVM, 1.4441, UNS S31673 - physical and mechanical properties
Physical properties of Sandvik Bioline 316LVM steel, a replacement for 1.4441 steel:
- Density: 8 g/cm3
- Specific heat capacity: 485 J/kg⋅K
- Thermal conductivity: 14 W/m⋅K
- Young's modulus: 200 GPa
Typical room temperature mechanical properties according to DIN 17443; 1.4441 cold-drawn sheets without the heat treatment (K):
- Yield strength: >300 MPa
- Tensile strength: >610 MPa
- Elongation: >35%
Typical room temperature mechanical properties according to DIN 17443; 1.4441 cold-drawn sheets and rods without the heat treatment (K860):
- Yield strength: >690 MPa
- Tensile strength: 860-1100 MPa
- Elongation: >12%
Typical room temperature mechanical properties according to DIN 17443 for homogenized 1.4441 sheets and rods:
- Yield strength: >190 MPa
- Tensile strength: 490-690 MPa
- Elongation: >40%
Tensile strength of cold-drawn, not heat-treated (K) wires of various diameters:
- Diameter D:0.2-0.7mm: 1600-1850 MPa
- D:0.7-1.0mm: 1500-1750 MPa
- D:1.0-1.5mm: 1400-1650 MPa
- D:1.5-2.0mm: 1350-1600 MPa
Tensile strength of homogenized wires of various diameters:
- Diameter D=0.025-0.13mm: <1000 MPa
- D:0.13-0.23mm: <930 MPa
- D:0.23-0.38mm: <890 MPa
- D:0.38-0.50mm: <860 MPa
- D:0.50-0.65mm: <820 MPa
- D:>0.65mm: <800 MPa
Elongation of homogenized wires of various diameters:
- D:<0.23mm: >30%
- D:0.23-0.38mm: >35%
- D:>0.38mm: >40%
Corrosion behaviour
Sodium chloride - the steel showed excellent resistance when exposed to 5% sodium chloride at 35°C for 4 days in accordance with EN ISO 9227.
Steam - good to excellent resistance when exposed to water steam at 134°C (3 cycles, 20 minutes each). Welded parts show adequate to good resistance.
Heat treatment, working and machining
Typical heat treatment parameters:
- Forging: 850-1100°C
- Annealing: 1050-1120°C
- Water Quenching or Air Cooling.
We deliver this steel alloy as:
- Bars, rods and forgings according to ISO 5832-1 / DIN 17443
- Wires according to ISO 5832-1 / DIN 17443
- Sheets and plates according to ISO 5832-1 / DIN 17443
Replacements, equivalents and other designations:
X2CrNiMo18-15-3, UGINE HQ316ESR, 316LM/1, Sandvik 316LSM, Sandvik Bioline 316LVM, Alloy 316LVM, 1.4441, UNS S31673, Sandvik 316LVM