Comparison of stainless steel pipes, ordinary steel pipes, and alloy steel pipes
1. Material composition and core characteristics
|
Type |
Main ingredients |
Core features |
|
stainless steel pipe |
iron-based alloy |
Corrosion resistant, high temperature resistant, attractive (can be polished), high price |
|
ordinary steel pipe |
carbon steel |
High strength, low cost, but prone to rust (requires galvanization/paint protection) |
|
alloy steel pipe |
Carbon steel + alloy elements |
High strength, high/low temperature resistance, wear resistance, for use in extreme conditions (such as high pressure, corrosion, low temperature) |
2. Typical steel grades and standards
|
Type |
Representative steel grades |
implementation standards |
Applicable scenarios |
|
stainless steel |
304 (18Cr-8Ni) |
ASTM A312 |
Chemical equipment, food and pharmaceutical pipelines |
|
ordinary carbon steel |
Q235B / ASTM A53 Gr.B |
GB/T 3091 / ASTM A53 |
Building structures, low-pressure fluid conveyance |
|
alloy steel |
15CrMoG / ASTM A335 P11 |
GB 5310 / ASTM A335 |
High-pressure boilers, petroleum cracking units |
3. Cost and applicable scenarios
|
Type |
relative cost |
Typical applications |
limitations |
|
stainless steel |
High (3-5 times) |
Chemical reactors, medical pipelines, high-end decoration |
High cost and difficult processing |
|
ordinary carbon steel |
low |
Construction scaffolding, drainage pipes, low-pressure gas |
Corrosive, short lifespan |
|
alloy steel |
Medium to high (2-3 times) |
Power station boilers, oil drilling, high-pressure valves |
Complex welding process |
Summary
| Stainless steel pipes | The preferred choice for corrosive environments/sanitary requirements, but high cost. |
| Ordinary carbon steel pipes | Low-cost structural applications, requiring regular anti-rust maintenance. |
| Alloy steel pipes | A balanced choice for extreme conditions (high pressure/high temperature/wear resistance). |
| Ultimate recommendation | Comprehensive selection based on four dimensions: medium corrosivity, mechanical load, temperature and pressure, and life cycle cost. Material life assessment is recommended for critical equipment. |
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