304 Stainless Steel Welded Pipe
304 stainless steel welded pipes exhibit excellent corrosion resistance, rust and moisture protection, and can adapt to outdoor humid and mildly acidic/alkaline environments, with stable temperature resistance. The material is safe, clean, and odorless, meeting food and water supply standards. Chinese 304 stainless steel welded pipe manufacturers provide pipes with precise dimensions, uniform wall thickness, good pressure resistance, durability, and a long service life.
The pressure-bearing capacity of 304 stainless steel welded pipes depends primarily on wall thickness, outer diameter, material strength, welding quality, and operating temperature, and must adhere to standardized safety factor design specifications. The following is a system description:
I.Core Influencing Factors
|
Influencing factors: |
Key Notes: |
|
Wall thickness (t) |
The greater the wall thickness, the stronger the pressure-bearing capacity, showing a direct correlation. |
|
Outer diameter (D) |
The larger the outer diameter, the lower the pressure-bearing capacity for the same wall thickness, showing an inverse correlation. |
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Material strength |
304 standard tensile strength ≥ 520MPa, yield strength ≥ 210MPa. |
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Welding quality |
Weld efficiency (E) affects actual pressure bearing capacity; high-quality welded pipes can achieve an E value of 0.85-0.95. |
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Operating temperature |
As temperature increases, allowable stress decreases; performance is optimal at room temperature (20℃). |
|
Safety factor |
Fluid pipes typically require 2-3 times the allowable stress; high-pressure hazardous media require 4 times or more. |
II. Pressure Calculation Formulas
1. Theoretical Burst Pressure (Barlow Formula): P₁=2σt/D (σ is tensile strength in MPa, t is wall thickness in mm, D is outer diameter in mm)
2. Allowable Working Pressure (Commonly Used in Engineering): P₂=(2×S×E×t)/(D−t) (S is allowable stress, E is weld efficiency, t is wall thickness, D is outer diameter) 304 stainless steel allowsable stress at room temperature S≈137-170MPa (based on 40% tensile strength)
III. Common Specification Pressure Reference Table (Room Temperature, Safety Factor 2)
|
Theoretical burst pressure (MPa) |
Permissible working pressure (MPa) |
Applicable Scenarios |
|
54.7 |
27.3 |
Low-pressure decorative pipes, furniture supports |
|
50 |
25 |
Door and window frames, small railings |
|
40.5 |
20.3 |
Stair handrails, interior decoration |
|
41.2 |
20.6 |
Balcony railings, engineering columns |
|
34.2 |
17.1 |
Large fences, landscape pipes |
|
29.6 |
14.8 |
Outdoor protection, general fluid transportation |
|
26.3 |
13.2 |
Industrial pipelines, water treatment systems |
Note: 1MPa≈10kg/cm², allowable pressure already considers safety factor
IV. Application Scenarios and Pressure Recommendations
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Application Scenarios |
Recommended operating pressure: |
Recommended wall thickness: |
|
Civilian water supply |
≤1.0MPa |
≥1.2mm |
|
Industrial fluids (non-corrosive) |
≤2.5MPa |
≥2.0mm |
|
Hot water systems |
≤1.6MPa |
≥1.5mm |
|
Low-pressure gas transmission |
≤0.6MPa |
≥1.0mm |
|
High-pressure conditions |
Customized thickened wall thickness + non-destructive testing required. |
≥3.0mm, X-ray inspection of welds |
Suitable for use: 304 stainless steel Applications of Stainless Steel Welded Pipes:
1. Outdoor Use: Balcony railings, outdoor stairs, courtyard fences, outdoor engineering components; resistant to rain and moisture, and less prone to rust.
2. Coastal Salt Fog Areas: Seaside buildings and facilities; effectively resists salt corrosion and is less prone to rust spots.
3. Drinking Water and Food Industry: Tap water transportation, catering equipment pipes, water purification equipment; safe, hygienic, and non-toxic material.
4. Humid Kitchen and Bathroom Environments: Kitchen and bathroom hardware, bathroom fittings, plumbing pipes; long-term resistance to moisture and oxidation.
5. Light Industrial Conditions: Ordinary chemical fluids, exhaust gas ventilation, environmental protection equipment pipes; resistant to mild acids and alkalis.
6. Long-Term Durability Projects: For long service life and reduced maintenance costs; a replacement for easily rusting pipes.
7. Suitable for Both High and Low Temperatures: Adaptable to daily high-temperature conditions; stable performance and no deformation in both hot and cold environments.
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