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Rod stainless steel Sanmac® 4305
tube

Rod stainless steel - Sanmac® 4305 - SANDVIK MATERIALS TECHNOLOGY - tube

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Characteristics

Form

rod, tube

Elasticity

Max.: 200 MPa

Min.: 165 MPa

Typical elongation

Max.: 100 %

Min.: 35 %

Description

Product overview

Sanmac® 4305 is an austenitic chromium-nickel steel supplied primarily as hollow bar with greatly improved machinability while retaining austenitic properties. Typical supply condition: solution annealed and white‑pickled.

Applications

Components requiring very high machinability where corrosion resistance and high‑stress performance are not the primary criteria.

Corrosion resistance

Good resistance to organic acids at moderate temperatures (except formic acid).
Resistant to sulphates, sulphides and sulphites.
Resistant to caustic solutions at moderate temperatures.
Resistant to oxidizing acids such as nitric acid.
Low carbon content provides good resistance to intergranular corrosion.
Austenitic steels (including Sanmac® 4305) can be susceptible to stress corrosion cracking above about 60°C in chloride-containing environments; alloys such as SAF 2304®, Alleima® 10RE51 or Sanmac® 2205 offer higher resistance under such conditions.
Sensitivity to pitting and crevice corrosion may occur in chloride-containing solutions; molybdenum-alloyed steels improve resistance.

Forms of supply

Primarily supplied as hollow bar, solution annealed and white‑pickled, available in various outside and inside diameters with guaranteed component sizes after machining. Improved tolerances available on special order. Solid bar forms also available in Sanmac grade.

Machining

Sanmac is Alleima's machinability concept: optimized machinability achieved via controlled non‑metallic inclusions, adjusted chemical composition and optimized production parameters.
Enables significantly higher cutting speeds (for example up to about twice those for Sanmac 304/304L) while maintaining austenitic material characteristics.
Detailed cutting data and tool recommendations are provided in brochure S-02909-ENG.

Technical data / specifications

Datasheet updated: 2025-05-09 (supersedes all previous editions)
Commercial designation: Sanmac® 4305
Brand: Alleima
Standards: ASTM: MT 303; UNS: S30300; EN Number: 1.4305
Product standards: EN 10297-2; EN 10294-2; ASTM A511
Chemical composition (nominal), %: C ≤ 0.035; Si 0.4; Mn 1.8; P ≤ 0.040; S 0.2; Cr 17.5; Ni 9
Heat treatment (recommended if further heat treatment needed): Stress relieving 850–950°C, cooling in air; Solution annealing 1000–1100°C, rapid cooling in air or water.
Forms of supply & tolerances: Hollow bar produced solution-annealed & white‑pickled; outside diameter tolerance +2/-0% (minimum +1/-0 mm); inside diameter tolerance +0/-2% (minimum +0/-1 mm); straightness ±1.5 mm/m.
Mechanical properties at 20°C (metric): Proof strength Rp0.2 ≥ 210 MPa; Proof strength Rp1.0 ≥ 230 MPa; Tensile strength ≥ 515 MPa; Elongation (A) ≥ 35%; Elongation (A2) ≥ 35%; Hardness HRB ≤ 90.
Impact strength: Good impact strength at room temperature and low temperatures.
Physical properties: Density = 7.9 g/cm³.
Thermal conductivity (W/m·°C): 20°C = 15; 100°C = 16; 200°C = 18; 300°C = 20; 400°C = 22; 500°C = 23; 600°C = 25; 700°C = 26.
Specific heat capacity (J/kg·°C): 20°C = 475; 100°C = 500; 200°C = 530; 300°C = 560; 400°C = 580; 500°C = 600; 600°C = 615; 700°C = 625.
Thermal expansion, mean values (×10⁻⁶ /°C): 30–100°C = 16.5; 30–200°C = 17.0; 30–300°C = 17.5; 30–400°C = 18.0; 30–500°C = 18.5; 30–600°C = 18.5; 30–700°C = 19.0.
Modulus of elasticity (as shown in datasheet): 20°C = 200 MPa; 100°C = 194 MPa; 200°C = 186 MPa; 300°C = 179 MPa; 400°C = 172 MPa; 500°C = 165 MPa.

Welding

Welding must be carried out with filler material under careful control due to sulphur addition. Recommended methods: TIG/GTAW (first choice), MIG/GMAW, MMA/SMAW. Recommended heat input & interpass: less than 1.0 kJ/mm and interpass temperature below 100°C.
Recommended filler metals (examples): ISO 14343 S 19 9 L / AWS A5.9 ER308L; ISO 14343 S 23 12 L / AWS A5.9 ER309L; ISO 14343 S 18 8 Mn / AWS A5.9 ER307; MMA: ISO 3581 E 19 9 L R / AWS A5.4 E308L-17; ISO 3581 E 23 12 L R / AWS A5.4 E309L-17.

Notes

Sanmac® is Alleima's trademark for improved machinability. See brochure S-02909-ENG for detailed machining data (turning, drilling, milling, sawing, etc.).