Sanmac® 4305 is an austenitic chromium-nickel steel with extremely high machinability. For example, cutting speeds of up to twice those for Sanmac 304/304L can be used.
Standards
-
ASTM: MT 303 -
UNS: S30300 -
EN Number: 1.4305
Product standards
- EN 10297-2, EN 10294-2
- ASTM A511
Chemical composition (nominal) %
| C |
Si | Mn | P |
S | Cr | Ni |
|---|---|---|---|---|---|---|
| ≤0.035 | 0.4 | 1.8 | ≤0.040 | 0.2 | 17.5 | 9 |
Applications
Sanmac® 4305 is a good choice for components where high machinability is needed, but where corrosion resistance and high stresses are not a concern.
Corrosion resistance
General corrosion
Sandvik Sanmac® 4305 has good resistance to:
- Organic acids at moderate temperatures, with the exception of formic acid
- Sulphates, sulphides and sulphites
- Caustic solutions at moderate temperatures
- Oxidizing acids like nitric acid
Intergranular corrosion
Sandvik Sanmac® 4305 has a low carbon content and therefore good resistance to intergranular corrosion.
Stress corrosion cracking
Austenitic steels are susceptible to stress corrosion cracking. This may occur at temperatures above about 60°C (140°F) if the steel is subjected to tensile stresses and at the same time comes into contact with certain solutions, particularly those containing chlorides. In applications demanding high resistance to stress corrosion cracking the austenitic-ferritic steels Sandvik SAF 2304®, Sandvik 10RE51 or Sandvik Sanmac® 2205 have higher resistance to stress corrosion cracking than 4305.
Pitting and crevice corrosion
The steel may be sensitive to pitting and crevice corrosion even in solutions of relatively low chloride content. Molybdenum-alloyed steels have better resistance and the resistance improves with increasing molybdenum content.
Forms of supply
Hollow bar- Finishes, dimensions and tolerances
Hollow bar in Sanmac 4305 can be produced in various sizes in the solution annealed and white-pickled condition.
Dimensions are given as outside and inside diameters with guaranteed component sizes after machining, see catalogues.
Outside diameter tolerance is +2/-0%, but minimum +1/-0mm
Inside diameter tolerance is +0/-2%, but minimum +0/-1mm
Straightness +/-1.5mm/m
Better tolerances can be supplied on special order.
Other forms of supply
Bar
Steel with improved machinability, Sanmac, is also available in bar.
Mechanical properties
At 20°C (68°F)
| Proof strength | Tensile strength | Elong. | Hardness | ||
|---|---|---|---|---|---|
| Rp0.2a | Rp1.0a | Rm | Ab | A2" | HRB |
| MPa | MPa | MPa | % | % | |
| ≥210 | ≥230 | ≥515 | ≥35 | ≥35 | ≤90 |
| Proof strength | Tensile strength | Elong. | Hardness | ||
|---|---|---|---|---|---|
| Rp0.2a | Rp1.0a | Rm | Ab | A2" | HRB |
| ksi | ksi | ksi | % | % | |
| ≥30 | ≥33 | ≥75 | ≥35 | ≥35 | ≤90 |
1 MPa = 1N/mm2
a)Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength, respectively.
b) Based on L0 = 5.65 ÖS0 where L0 is the original gauge length and S0 the original cross-section area.
Impact strength
Sandvik Sanmac® 4305 possesses good impact strength both at room temperature and at low temperatures.
Physical properties
Density: 7.9 g/cm3, 0.29 lb/in3
| Temperature, °C | W/m °C | Temperature, °F | Btu/ft h °F |
|---|---|---|---|
| 20 | 15 | 68 | 8.5 |
| 100 | 16 | 200 | 9.5 |
| 200 | 18 | 400 | 19.5 |
| 300 | 20 | 600 | 12 |
| 400 | 22 | 800 | 13 |
| 500 | 23 | 1000 | 14 |
| 600 | 25 | 1200 | 15 |
| 700 | 26 | 1300 | 15 |
| Temperature, °C | J/kg °C | Temperature, °F | Btu/lb °F |
|---|---|---|---|
| 20 | 475 | 68 | 0.11 |
| 100 | 500 | 200 | 0.12 |
| 200 | 530 | 400 | 0.13 |
| 300 | 560 | 600 | 0.13 |
| 400 | 580 | 800 | 0.14 |
| 500 | 600 | 1000 | 0.14 |
| 600 | 615 | 1200 | 0.15 |
| 700 | 625 | 1300 | 0.15 |
| Temperature, °C | Per °C | Temperature, °F | Per °F |
|---|---|---|---|
| 30-100 | 16.5 | 86-200 | 9.5 |
| 30-200 | 17 | 86-400 | 9.5 |
| 30-300 | 17.5 | 86-600 | 10 |
| 30-400 | 18 | 86-800 | 10 |
| 30-500 | 18.5 | 86-1000 | 10 |
| 30-600 | 18.5 | 86-1200 | 10.5 |
| 30-700 | 19 | 86-1400 | 10.5 |
| Temperature, °C | MPa | Temperature, °F | ksi |
|---|---|---|---|
| 20 | 200 | 68 | 29.0 |
| 100 | 194 | 200 | 28.2 |
| 200 | 186 | 400 | 26.9 |
| 300 | 179 | 600 | 25.8 |
| 400 | 172 | 800 | 24.7 |
| 500 | 165 | 1000 | 23.5 |
Welding
Welding of Sanmac® 4305 should be carried out with filler material under carefully control due to Sulphur addition in the material. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.
For Sanmac® 4305, heat input of <1.0 kJ/mm and interpass temperature of <100°C (210°F) are recommended.
Recommended filler metals
TIG/GTAW or MIG/GMAW welding
ISO 14343 S 19 9 L / AWS A5.9 ER308L (e.g. Exaton 19.9.L)
ISO 14343 S 23 12 L / AWS A5.9 ER309L (e.g. Exaton 24.13.L)
ISO 14343 S 18 8 Mn / AWS A5.9 ER307 (e.g. Exaton 18.8.Mn)
MMA/SMAW welding
ISO 3581 E 19 9 L R / AWS A5.4 E308L-17(e.g. Exaton 19.9.LR)
ISO 3581 E 23 12 L R / AWS A5.4 E309L-17(e.g. Exaton 24.13.LR)