Material Overview
1. Carbon Steel Pipes
Definition: Iron-carbon alloy pipes (C ≤2.1%) with optional manganese, silicon, or copper additives. Manufactured via seamless (hot/cold rolling) or welded (ERW, LSAW) processes.
Key Traits: High strength-to-cost ratio, weldability, and adaptability to coatings.
2. Stainless Steel Pipes
Definition: Iron-based alloy pipes with ≥10.5% chromium, forming a self-healing oxide layer. Common grades: 304 (18/8), 316 (Mo-added), and duplex steels (2205).
Key Traits: Corrosion resistance, hygiene, and aesthetic appeal.
Core Advantages
|
Property |
Carbon Steel Pipes |
Stainless Steel Pipes |
|
Strength |
Tensile strength 400–550 MPa, ideal for heavy loads. |
Tensile strength 500–800 MPa (duplex grades). |
|
Corrosion Resistance |
Requires external coatings (epoxy, galvanizing). |
Inherent resistance to rust, acids, and chlorides. |
|
Temperature Range |
-29°C to +425°C (API 5L Grade X70). |
-196°C (cryogenic) to 1150°C (310S alloy). |
|
Cost Efficiency |
Lower material cost, suitable for large-scale projects. |
Higher initial cost but lower lifecycle costs. |
|
Maintenance |
Regular coating inspection and repair needed. |
Minimal maintenance, ideal for harsh environments. |
Industry Applications
|
Industry |
Carbon Steel Pipes |
Stainless Steel Pipes |
|
Oil & Gas |
API 5L pipelines, structural supports for rigs. |
Subsea umbilicals, LNG cryogenic transfer. |
|
Chemical |
Acid/alkali transport with internal linings. |
Reactor piping, chloride-rich environments (316L). |
|
Construction |
Scaffolding, HVAC ducting (ASTM A53). |
Decorative handrails, curtain wall systems. |
|
Food & Pharma |
– |
Sanitary tubing (3A, EHEDG certified), CIP systems. |
Technical Specifications
1. Carbon Steel Pipes
Standards: API 5L, ASTM A106/A53, EN 10219.
Sizes: ½"–48" (DN15–DN1200), wall thickness SCH40–SCH160.
Coatings: 3PE, FBE, galvanized (ISO 21809 compliant).
2. Stainless Steel Pipes
Standards: ASTM A312/A358, EN 10217-7.
Sizes: ¼"–36" (DN6–DN900), wall thickness SCH5S–SCH80S.
Surface Finish: Annealed, pickled, or polished (Ra ≤0.8μm for sanitary use).
Sustainability
Carbon Steel: 90% recyclable, widely reused in construction and manufacturing.
Stainless Steel: 100% recyclable without quality loss, supporting circular economy.
The use of carbon steel pipes and stainless steel pipes is in line with the issue of environmental protection and circular economy.