JIS G3461 STB340S Carbon Steel Tube For Boiler Heat Exchanger, Boiler Water Tube, Economizer Tube
Price:
Negotiable
MOQ:
1PC
Delivery Time:
5-80 Days
Brand:
YUHONG
Product Description
JIS G3461 STB340S Carbon Steel Tube For Boiler Heat Exchanger, Boiler Water Tube, Economizer Tube
ASTM A270 TP304 austenitic stainless steel seamless pipe conforms to the American Society for Testing and Materials (ASTM) A270/A270M standards. It is an 18-8 type stainless steel, with a seamless structure achieved through hot rolling/cold drawing, resulting in a weld-free, high-pressure-resistant, and high-strength finish.
The pipe ends are precision CNC threaded, ensuring high accuracy and concentricity. They can be directly and quickly screwed onto standard fittings, valves, and connectors, achieving a tight seal without welding. The pipes are replaceable, leak-proof, and pressure-resistant.
TP304 material offers excellent corrosion resistance, is hygienic and non-toxic, easy to clean, and has a smooth inner wall. It meets 3-A and FDA hygiene requirements, is resistant to high-temperature steam sterilization, and is compatible with CIP/SIP cleanroom systems.
Widely used in food and beverage, pharmaceutical, bioengineering, clean fluid, water supply and drainage, and chemical piping industries, it is an ideal pipe material for sanitary and industrial-grade threaded connections.
| Chemical Composition (Ladle Analysis, %) | |||
| Element | STB340S Requirement (max or range) | Typical Value | Standard Reference |
| C (Carbon) | ≤ 0.25 | ~0.15–0.20 | JIS G3461 |
| Si (Silicon) | 0.10 – 0.35 | ~0.20 | JIS G3461 |
| Mn (Manganese) | 0.30 – 0.80 | ~0.50 | JIS G3461 |
| P (Phosphorus) | ≤ 0.030 | ≤0.020 | JIS G3461 (stricter for S grade) |
| S (Sulfur) | ≤ 0.015 | ≤0.010 | JIS G3461 (stricter for S grade) |
| Mechanical Properties | ||
| Parameter | Requirement | Standard Reference |
| Tensile Strength (Rm) | ≥ 340 MPa | JIS G3461 |
| Yield Strength (Rp0.2 or lower yield point ReL) | ≥ 195 MPa (wall thickness ≤16mm) | JIS G3461 |
| Elongation (longitudinal, 50mm gage length) | ≥ 30% (WT ≤8mm) | JIS G3461 |
| ≥ 28% (8 < WT ≤16mm) | ||
| ≥ 27% (WT >16mm) | ||
| Flattening Test | No cracks | JIS G3461 |
| Flaring Test | No cracks | JIS G3461 |
| Physical Properties | ||
| Parameter | Value | Unit |
| Density | ~7.85 | g/cm³ |
| Elastic Modulus (20°C) | ~205 | GPa |
| Thermal Conductivity | ~50 | W/(m·K) |
| Coefficient of Linear Expansion (20–300°C) | ~12.0 | ×10⁻⁶/°C |
| Specific Heat Capacity | ~460 | J/(kg·K) |
| Heat Treatment Requirements | ||
| Condition | Process | Requirement |
| Delivery Condition | Normalized or Annealed | Final heat treatment must be performed after manufacturing |
| Normalizing Temperature | Approx. 880–930°C, air cooling | Ensures grain refinement and uniform mechanical properties |
| Annealing Temperature | Approx. 880–930°C, furnace cooling | Softens the tube, reduces hardness |
Application
- Boiler Systems: Water-cooled wall tubes, flue tubes, and boiler body piping for small industrial boilers
- Heat Exchangers: Shell-and-tube heat exchangers, condensers, and cooler tube bundles
- Pipeline Systems: Medium and low-pressure steam pipelines and water supply pipelines
- General Pressure Vessels: Heat exchange elements subjected to medium temperature and pressure
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Company
Yuhong Group Co.,Ltd
Location
20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
Contact Person
Jikin Cai