ASTM A312 Pipe
SSM supplies Seamless and Welded Austenitic Stainless Steel Pipes
A312 Seamless and Welded Austenitic Stainless Steel Pipes
SSM offers austenitic stainless steels, such as 304, 304L, 316, 316L, 321, and 347. Our seamless and welded stainless steel pipes are extensively utilized in the petrochemical, chemical, food processing, pharmaceutical, power, and marine engineering industries. They are particularly suitable for applications that demand high resistance to corrosion and high-temperature performance. For more detailed information, please refer to the following:
A312 seamless and welded stainless steel supplier, SSM provides product parameters as shown in the following table:
| Items | Parameters |
| OD | NPS 1/8″ – NPS 30″ |
| WT | Common wall thickness specifications include SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, XXS (extra strong wall), etc. |
| Length | 20 feet (6 meters) or 40 feet (12 meters), according to customer requirements. |
| Grade | 304、304L、316、316L、321、347, etc. |
| Standards | ASTM A312 / ASME B36.19 M |
Chemical Composition & Mechanical Properties
SSM supplies seamless and welded stainless steel pipes. ASTM A312 specifications ensure that these chemical compositions meet required standards for a wide range of high-temperature and corrosive environments.
| Grade | 304 | 304L | 316 | 316L | 321 | 347 |
| C | ≤0.08 | ≤0.03 | ≤0.08 | ≤0.03 | ≤0.08 | ≤0.08 |
| Mn | ≤2.00 | ≤2.00 | ≤2.00 | ≤2.00 | ≤2.00 | ≤2.00 |
| P | ≤0.045 | ≤0.045 | ≤0.045 | ≤0.045 | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 | ≤0.030 | ≤0.030 | ≤0.030 | ≤0.030 |
| Si | ≤0.75 | ≤0.75 | ≤0.75 | ≤0.75 | ≤0.75 | ≤0.75 |
| Cr | 18.00-20.00 | 18.00-20.00 | 16.00-18.00 | 16.00-18.00 | 17.00-19.00 | 17.00-19.00 |
| Ni | 8.00-10.50 | 8.00-12.00 | 10.00-14.00 | 10.00-14.00 | 9.00-12.00 | 9.00-13.00 |
| Mo | – | – | 2.00-3.00 | 2.00-3.00 | – | – |
| Ti | – | – | – | – | 5x(C+N)-0.70 | – |
| Nb | – | – | – | – | – | 10x(C+N)-1.10 |
| N | ≤0.10 | ≤0.10 | ≤0.10 | ≤0.10 | ≤0.10 | ≤0.10 |
The mechanical properties of each grade also differ:
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (Brinell) |
| 304 | ≥515 | ≥205 | ≥35 | ≤201 |
| 304L | ≥515 | ≥205 | ≥35 | ≤201 |
| 316 | ≥515 | ≥205 | ≥35 | ≤217 |
| 316L | ≥515 | ≥205 | ≥35 | ≤217 |
| 321 | ≥515 | ≥205 | ≥35 | ≤217 |
| 347 | ≥515 | ≥205 | ≥35 | ≤217 |
Manufacturing & Tolerance Requirements
Manufacturing Methods
Seamless and welded.
Heat treatment is required.
Tolerance Requirements
| Permitted Variations in Wall Thickness | ||
| Tolerance,%from Nominal | ||
| NPS Designator | Over | Unders |
| 1/8 %to 2%incl, all t/D ratios | 20 | 12.5 |
| 3 to 18 incl., t/D up to 5% incl. | 22.5 | 12.5 |
| 3 to 18 incl., t/D>5% incl. | 15 | 12.5 |
| 20 and larger,welded,all t/D ratios | 17.5 | 12.5 |
| 20 and larger,seamless, t/D up to 5%incl. | 22.5 | 12.5 |
| 20 and larger,seamless, t/D>5% | 15 | 12.5 |
where: t =Nominal Wall ThicknessD =Ordered Outside Diameter
Lengths
Unless otherwise agreed upon, all sizes from NPS 1⁄8 to and including NPS 8 are available in lengths up to 24 ft (Note 4). The permissible range is from 15 to 24 ft (Note 4). Shorter lengths are acceptable, and the number and minimum length should be agreed upon between the manufacturer and the purchaser.
Advantages and Disadvantages of ASTM A312
By weighing these advantages and disadvantages, engineers and decision-makers can determine the suitability of ASTM A312 stainless steel pipes for their specific applications and requirements.
Advantages:
Austenitic stainless steel offers excellent corrosion resistance, as well as resistance to acid, alkali, and chlorine. It is also known for its high strength, ease of welding, and non-magnetic properties. Additionally, it can provide an absorbent surface finish for decorative or sanitary applications.
Disadvantages:
Because of its high content of alloying elements such as nickel and chromium, austenitic stainless steel tends to be more expensive, has low thermal conductivity, and is prone to electrochemical corrosion.
Applications of ASTM A312 Pipes
- Oil and Gas Industry: Used for transporting oil, natural gas, and other fluids in pipelines.
- Chemical Processing: Suitable for handling aggressive chemicals and high-pressure environments.
- Power Generation: ASTM A312 pipes can be effectively used in tube fin machines, essential in heat exchangers and other thermal management systems.
- Pharmaceuticals: Employed in the production and transport of pharmaceuticals and food products.
Comparison of ASTM A312 and ASTM A790 Pipes
ASTM A312: Preferred for applications requiring excellent corrosion resistance and good high-temperature strength. Commonly used in a wide range of industries including petrochemical, food processing, and pharmaceuticals.
ASTM A790: Suitable for applications needing higher strength and good corrosion resistance, particularly in environments with chloride exposure. More cost-effective for certain applications due to lower nickel content.
| Feature | ASTM A312 | ASTM A790 |
| Material | Austenitic stainless steel | Ferritic/austenitic (duplex) stainless steel |
| Common Grades | 304, 304L, 316, 316L, 321, 347 | S31803, S32205, S32750, S32760 |
| Application | High temperature and pressure, corrosion resistance | High strength, good corrosion resistance, chloride environments |
| Manufacturing Process | Seamless and welded | Seamless and welded |
| Heat Treatment | Required | Required |
| Strength | High strength and ductility | Higher strength, good ductility and toughness |
| Corrosion Resistance | Excellent | Very good, especially in chloride environments |
| Stress Corrosion Cracking | Susceptible | Better resistance |
| Cost | Higher due to nickel content | More cost-effective due to lower nickel content |
| Ductility | Good | Less than austenitic stainless steels |
| Weldability | Good | More challenging |
Related Products
