347 Hot Rolled Steel Round Bar
Certification:ASTM, GB, EN, DIN, JIS
Shape:Round
Technique:Hot/Cold Rolled
Surface Treatment：Polished
Dimensions:5-400mm
Tolerance:0/+1.0mm(Turned) -0/+5.0mm(Black)
Transport Package:in Bundles or Wooden Box
What is 347 Hot Rolled Steel Round Bar?
347 stainless steel round bar is a round cross-section steel produced by hot rolling process. 347 stainless steel is a stabilized austenitic stainless steel, with niobium and tantalum added as stabilizers to inhibit the precipitation of chromium carbides, significantly improve intergranular corrosion (especially in the sensitization temperature range of 650-850℃), and has excellent high temperature strength and oxidation resistance. Common standards include ASTM A276 (stainless steel bars and profiles), ASTM A479 (stainless steel bars for pressure vessels), etc.
347 Stainless Steel Bright Round Rod
347 Stainless Steel Forged Bar Advantages
347 stainless steel bars are formed into round bars by high temperature (1100-1200℃) rolling. Oxide scale (black skin) may remain on the surface. The dimensional tolerance is slightly larger than that of cold-processed products. After hot rolling, annealing treatment (stress relief and plasticity improvement) can be carried out according to needs, or direct delivery.
What should be paid attention to when welding 347 stainless steel?
Welding material selection: Match niobium-containing welding wire (such as ER347) to avoid carbide precipitation.
Heat treatment: No forced annealing is required after welding, but solution treatment (quenching at 1020–1100°C) is recommended for long-term high-temperature service parts.
Note: Control heat input to prevent intergranular corrosion and thermal cracking.
Why Choose GNEE
GNEE provides ASTM A276 material certificate to confirm Cr≥24%, Ni≥19%, and rejects non-standard low-priced materials; additional oxidation resistance weight gain test (ASTM G54) can be added to verify the oxidation rate at 1150°C; grinding grade 347 cold-drawn bars are preferred for precision parts, and 347 hot-rolled pickled bars can be selected for ordinary structural parts to reduce costs.
If you need samples, high temperature performance test data or processing technology guidance, please contact our technical team!
347 Cold Finished Stainless Steel Bar Specification
347 Stainless Steel Bar Chemical Composition (Weight %)
| Element | Content |
|---|---|
| Carbon (C) | ≤0.08% |
| Chromium (Cr) | 17.0–19.0% |
| Nickel (Ni) | 9.0–12.0% |
| Niobium (Nb) | ≥10×C% |
| Manganese (Mn) | ≤2.0% |
| Silicon (Si) | ≤1.0% |
| Phosphorus (P) | ≤0.045% |
| Sulfur (S) | ≤0.03% |
347 SS Bar Mechanical Properties (Annealed Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥515 MPa |
| Yield Strength (0.2% Offset) | ≥205 MPa |
| Elongation (50 mm) | ≥30% |
| Hardness (HB) | ≤201 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.98 g/cm³ |
| Melting Point | 1370–1400°C |
| Thermal Conductivity | 16 W/m·K (100°C) |
| Coefficient of Thermal Expansion | 17.2×10⁻⁶/°C (20–100°C) |
Dimensions & Tolerances
| Parameter | Range |
|---|---|
| Diameter | 10–300 mm (customizable up to 450 mm) |
| Length | 6 m (custom lengths available) |
| Straightness | ≤3 mm/m |
| Surface Finish | Hot-rolled with oxide scale (black surface), optional pickling or grinding |
ASTM A276 Type 347 Rod Manufacturer
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