Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASTM A312 (ASME SA312) TP304 Stainless Steel Seamless Pipe for Petrochemical Application
YUHONG GROUP deal with stainless steel seamless pipe and tube already more than 33 years, every year sell more than 80000 tons of stainless steel seamless pipe and tube. Our client already cover more than 65 countries. Our stainless steel seamless pipe and tube was width used in Mining, Energy, Petrochemical, Chemical Industry, Food plant, Paper plant, Gas and Fluid Industry etc.
The ASTM A312 TP304 Pipe is used for high pressure and high temperature applications because of the high operating temperature of 870 degrees Celsius and the strength. The minimum yield strength of the SS UNS S30400 ERW Pipe is 205MPa and the minimum tensile strength is 515MPa. The applications include commercial, industrial, domestic and general corrosive services. The ASME SA312 Grade 304 Welded Pipe is one of the most cost effective stainless steel pipes in the market. These are also the most used of stainless steel pipes in the world.
The standard specifications include seamless, straight seam welded and heavily cold welded austenitic stainless steel tubing for high temperature and general corrosive service. There are several grades in this standard, and each steel grade shall confirm to the required chemical composition of C, Mn, P, S, Si, Cr and Cr, Ni, Mo, etc. All the pipes shall be furnished in the heat-treated condition in accordance with the required heat treating temperature and cooling/testing requirements. And also need to comply to the required tensile strength and yield strength.
Chemical Composition Requirements
| Element | Composition for TP304, % | Composition for TP304L, % |
| C | ≤0.08 | ≤0.035 |
| Mn | ≤2.00 | ≤2.00 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
| Si | ≤1.00 | ≤1.00 |
| Cr | 18.0~20.0 | 18.0~20.0 |
| Mo | 8.0~11.0 | 8.0~13.0 |
*UNS designation of TP304: S30400; UNS designation of TP304L.
Mechanical Properties
| Tensile Requirements | TP304 | TP304L |
| Tensile Strength min. MPa [ksi] | 515 [75] | 485 [70] |
| Yield Strength min. MPa [ksi] | 205 [30] | 170 [25] |
| Elongation in 2", min, % (*L) | 35 | 35 |
| Elongation in 2", min, %(*T) | 25 | 25 |
Physical properties of 304 grade stainless steel in the annealed condition
Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | EN |
| 304 | 1.4301 | S30400 | SUS 304 | 304S31 | X5CrNi18-10 |
| 304L | 1.4306 | S30403 | SUS 304L | 304S11 | X2CrNi19-11 |
| 304H | 1.4306 | S30409 | - | 304S51 | X6CrNi18-11 |
Application
