Seamless Stainless Steel TP904L Pipe
Distinguished by its high Nickel and Molybdenum content and the strategic addition of Copper (Cu), our 904L tubing offers superior resistance to strong reducing acids, particularly dilute sulfuric acid, across the entire concentration range. These pipes are indispensable for mission-critical applications in chemical reactors, seawater cooling systems, and pharmaceutical processing. Through advanced cold-drawing and precise solution annealing, GZH ensures every pipe maintains a uniform microstructure and optimized mechanical strength for the most demanding industrial environments.
PREN≥35,higher than TP316L PREN≥24
What Is a Seamless Stainless Steel TP904L Pipe?
Seamless Stainless Steel TP904L Pipe(also called Seamless Stainless Steel N0894 Pipe) is a cylindrical tube crafted from a single, solid billet of stainless steel. Like other seamless products, it has no weld joint, ensuring maximum structural integrity and high-pressure ratings.
The"904L"designation signifies a super austenitic grade with low carbon content ("L"). Its key differentiator is the high level of alloying elements, particularly molybdenum andcopper. Molybdenum provides superior resistance to pitting and crevice corrosion, while copper significantly enhances resistance to reducing acids like sulfuric acid. This unique combination makes 904L a top performer in some of the most aggressive corrosive media.
Key Features and Advantages
TP904L Seamless Stainless Steel Pipe offer a unique combination of benefits that make them invaluable in demanding applications:
Extreme Corrosion Resistance: The high molybdenum and copper content provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich and acidic environments.
Excellent Resistance to Reducing Acids: It is particularly effective against sulfuric acid, making it a preferred choice over 316L in such applications.
High Pressure Tolerance: The seamless construction provides a uniform, robust structure that safely handles high internal pressures, which is critical in fluid transport.
Good Weldability: Despite its high alloy content, 904L offers good weldability without the need for post-weld heat treatment due to its low carbon content.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 904L stainless steel.
Table 1: Chemical Composition of Stainless Steel 904L
The composition of Stainless Steel 904L is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | P | S | Mo | Cu | Mn | Si | C |
| 19.00 - 23.00 | 23.00 - 28.00 | ≤ 0.045 | ≤ 0.035 | 4.00 - 5.00 | 1.00 - 2.00 | ≤ 2.00 | ≤ 1.00 | ≤ 0.02 |
Table 2: Typical Mechanical Properties of Stainless Steel 904L
Stainless Steel 904L is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 490 MPa |
| Yield Strength | ≥ 220 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 192 HBW |
Table 3: Typical Physical Properties of Stainless Steel 904L
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 8.0 g/cm³ |
| Melting Point | 1300 - 1390 °C approx. |
| Thermal Expansion | 16.5 µm/m·°C (20-100°C) |
| Thermal Conductivity | 13.9 W/m·K (20°C) |
| Modulus of Elasticity | 195 GPa |
| Electrical Resistivity | 0.85 x 10⁻⁶ Ω·m (20°C) |
Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| ASTM A312 | D≤48.3 | +0.4/-0.8 | 10.3 | +20%-12.5% | +6.0/0 | ||
| 48.3 | ±0.8 | 88.9 | +22.5%/-12.5% | ||||
| 114.3 | +1.6/-0.8 | 88.9 | +15%/-12.5% | ||||
| 219.1 | +2.4/-0.8 | D≥508, t/D≤5%,SMLS | +22.5%/-12.5% | ||||
| 457.2 | +3.2/-0.8 | D≥508, t/D>5%,SMLS | +15%/-12.5% | ||||
| 660.4 | +4.0/-0.8 | D≥508, WELD | +17.5%/-12.5% | ||||
| 863.6 | +4.8/-0.8 | ||||||
| JIS 3459 Hot-Finished Smls Pipe | D＜50 | ±0.51 | S＜4 | ±0.5 | |||
| D≥50 | ±1.0% | S≥4 | ±12.5% | ||||
| JIS 3459 Cold-Finished | D＜30 | ±0.3 | S＜2 | ±0.2 | |||
| D≥30 | ±1.0% | S≥2 | ±10.0% | ||||
| JIS G3463 Hot-Finished Smls Pipe | 100 | +0.4/-0.8 | D＜100， S<2 | / | D<50, L<7M | +7/0 | |
| D＜100， 2≤S<2.4 | +40%/0 | D<50,7< L<10M | +10/0 | ||||
| D＜100， 2.4≤S<3.8 | +35%/0 | ||||||
| D＜100， 3.8≤S<4.6 | +33%/0 | ||||||
| D＜100， 4.6≤S | +28%/0 | D<50,10< L<13M | +13/0 | ||||
| 100≤D<120 | +0.4/-1.2 | D>100, S＜2 | / | ||||
| 120≤D<160 | D>100， 2≤S<2.4 | / | D<50,13M< L | +15/0 | |||
| 160≤D<200 | +0.4/-1.8 | D>100， 2.4≤S<3.8 | +35%/0 | ||||
| 200≤D | +0.4/-2.4 | D>100， 3.8≤S<4.6 | +33%/0 | D>50,7< L<7M | +10/0 | ||
| D>100， 4.6≤S | +28%/0 | ||||||
| JIS G3463 Cold-finished | <60 | +0.4/-0.8 | D<40, S<2.0 | +0.4/0 | |||
| 60≤D<80 | ±0.3 | D<40, S≥2.0 | +20%/0 | D>50,7< L<10M | +13/0 | ||
| 80≤D<100 | ±0.4 | D≥40 | +22%/0 | ||||
| 100≤D<120 | +0.4/-0.6 | ||||||
| 120≤D<160 | +0.4/-0.8 | D>50,10M< L | +15/0 | ||||
| 160≤D<200 | +0.4/-1.2 | ||||||
| 200≤D | +0.4/-1.6 | ||||||
| GB/T 14975 冷拔(扎)钢管 | D<12.7 | ±0.3 | ±0.1 | 所有壁厚，普通级PA | +12.5%/-10% | ||
| 12.7 | ±0.15 | ||||||
| 38.1 | ±0.4 | ±0.3 | |||||
| 88.9 | ±0.9% | ±0.4 | |||||
| 139.7 | ±0.8 | 所有壁厚，高级PC | ±10% | ||||
| 203.2 | ±1.1 | ||||||
| 219.1 | ±1.6 | ||||||
| D≥323.9 | ±0.5% | ||||||
| GB/T 14976 冷拔(轧)钢管 | 6 | ±0.2 | ±0.15 | S≤3 | ±12%(10% /0高级PC) | ||
| 10≤D<30 | ±0.2 | ±0.2 | |||||
| 30≤D<50 | ±0.2 | ±0.3 | S>3 | +12.5%/-10%(10%/0高级PC) | |||
| 50≤D<219 | 0.85% | 0.75% | |||||
| D>219 | 0.9% | 0.8% | Smin, all | +22%/0(+20%/0高级PC) | |||
Common Applications
The extreme corrosion resistance of 904L stainless steel seamless pipes makes them a preferred choice for:
Chemical and Petrochemical: For handling sulfuric, phosphoric, and other aggressive acids.
Pulp and Paper Industry: For bleaching equipment that handles corrosive chemicals.
Offshore and Marine: Used in saltwater environments for components requiring superior corrosion resistance.
Pharmaceutical and Food Processing: In systems that require the highest level of corrosion resistance and hygiene.
Manufacturing Process
The manufacturing of a Seamless TP904L Stainless Steel Pipe is a precise, multi-step process:
- Heating: A solid steel billet is heated to a high temperature.
- Piercing: A piercing mill pushes a mandrel through the center of the heated billet to form a hollow shell.
- Rolling and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
- Finishing: The pipe is cut to length, heat-treated, and subjected to finishing processes like pickling to achieve its final state.
This meticulous process ensures that every 904L seamless pipe meets the highest standards for performance and reliability in the most demanding applications.
