304 Stainless Steel Flange Wholesaler: 304, 304L, 304H
Chemical Composition of 304 Stainless Steel Flange (304/L/H)
| Elemento | C | Cr | Ni | Minnesota | Si | P | S | norte |
|---|---|---|---|---|---|---|---|---|
| 304 | ≤ 0.08 | 18.0 – 20.0 | 8.0 – 11.0 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.10 |
| 304L | ≤ 0.03 | 18.0 – 20.0 | 8.0 – 12.0 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.10 |
| 304H | 0.04 – 0.10 | 18.0 – 20.0 | 8.0 – 11.0 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 | – |
Key Differences
- 304 (Standard):
The standard “18-8” stainless steel,suitable for most general corrosive environments. - 304L (Low Carbon):
By limiting the carbon content to 0.03% or less,this grade effectively prevents carbide precipitation during welding,thereby avoiding “weld corrosion.” It is suitable for applications where no post-weld heat treatment is performed. - 304H (High Carbon):
The minimum carbon content is specified as 0.04%.The higher carbon content significantly improves the material’s creep strength and mechanical properties at high temperatures above 500°C.
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Mechanical Properties of 304 Stainless Steel Flange Series
The main differences lie in yield strength and creep strength at high temperatures.Due to its lower carbon content,304L has slightly lower strength than standard 304;whereas 304H,with its higher carbon content,exhibits greater durability in high-temperature environments.
| Performance Metrics | 304 | 304L | 304H |
|---|---|---|---|
| Fuerza de Tensión | ≥ 515 MPa | ≥ 485 MPa | ≥ 515 MPa |
| Yield Strength 0.2% | ≥ 205 MPa | ≥ 170 MPa | ≥ 205 MPa |
| Elongation in 50mm | ≥ 30% | ≥ 30% | ≥ 30% |
| Hardness, Brinell | ≤ 187 HBW | ≤ 187 HBW | ≤ 192 HBW |
Analysis of Key Differences
304L Has Slightly Lower Strength:
Because the carbon content has been reduced to improve weldability ,the tensile strength and yield strength of 304L are approximately 5–15% lower than those of standard 304.When designing high-pressure piping systems,this may result in 304L flanges having slightly lower pressure ratings than 304 flanges within certain temperature ranges.
High-temp Advantages of 304H:
Although 304H has strength properties at room temperature that are essentially identical to standard 304,its true value is realized at temperatures above 500°C (932°F).The higher carbon content significantly improves the material’s creep strength,making it less prone to deformation or fracture under prolonged high-temperature stress.
Doble certificación:
As a professional supplier of 304 stainless steel flanges,Kaysuns can provide you with these dual-certified flanges.The carbon content of the material is less than 0.03% ,while a specialized manufacturing process ensures that its strength meets the standard 304 level.These flanges meet the requirements of both specifications.
Purchasing Recommendations
- If your system involves extensive welding and operates under moderate pressure,choose 304L.
- For extremely high-temperature environments (above 525°C),304H must be selected.
- For general applications,304 or 304/304L dual-grade flanges are the most economical and versatile choice.
4 Manufacturing Methods for 304 Stainless Steel Flange
Forging
Centrifugal Casting
Plate Cutting
Ring Rolling
Ring rolling is the preferred method for large flanges.It involves heating a stainless steel strip or profile,bending it into a ring,welding the joint,and then machining it.
Applications of 304 Stainless Steel Flange (304/L/H)
304 Stainless Steel Flange
- Alimentación y bebidas
- Water Supply
- Light Chemical Industry
- Architectural & structural
- Pharmaceuticals & Medical
304L Stainless Steel Flange
- Heavy-Wall Welded Piping
- Chemical Storage & Transport
- Industria papelera
- Nuclear & Energy Power
- Pharmaceutical High-Purity Water
304H Stainless Steel Flange
- Industrial Boilers & Superheaters
- Petrochemical Heat Exchangers
- Pressure Vessels & Nuclear Power
- Flare Systems & Exhaust Manifolds
- Molten Salt Storage & CSP
FAQs About 304 Stainless Steel Flange Grades
Not necessarily.Although 304L offers better corrosion resistance and is easier to weld,its mechanical strength is approximately 15% lower than that of standard 304.
We recommend purchasing flanges with “dual certification.”This material is produced using a specialized manufacturing process that combines the low-carbon properties of 304L with the strength of standard 304.
When welding standard 304 stainless steel,carbon combines with chromium to form chromium carbides,which reduces the chromium content at the weld edges and consequently lowers its corrosion resistance.
304L has an extremely low carbon content,so there is not enough carbon to deplete the chromium during welding;therefore,the weld retains its original corrosion resistance.
Not suitable for high-temperature environments.304H is specifically designed for operating conditions above 525°C.At such high temperatures,corrosion resistance is no longer the primary consideration;the key is to ensure that the material does not soften or elongate when heated.
304H has a higher carbon content,making it more susceptible to sensitization in the heat-affected zone during welding.When welding 304H,it is recommended to strictly control the interpass temperature and use compatible high-carbon welding consumables.
They cannot be distinguished by the naked eye.The appearance,color,weight,and magnetic properties of 304,304L,and 304H are virtually identical.They can only be distinguished by checking the material stamp on the side of the flange,reviewing the material certificate,or conducting a PMI test.
Contacto
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
