GB/T 38681 NS1101 Seamless Steel Tube Corrosion Resistant Alloy Steel Pipes For Industrial Furnace
GB/T 38681 NS1101 NS1102 NS1104 NS1402 NS3306 Seamless Steel Tube Corrosion Resistant Alloy Steel Pipes For Industrial Furnace
Material
The GB/T 38681 standard specifies the requirements for seamless steel tubes made from corrosion-resistant alloy steel, designed for use in industrial furnaces. These pipes are engineered to withstand high temperatures and corrosive environments, making them suitable for various industrial applications.
Specification
The seamless steel tubes covered under this standard are categorized into different grades, each with specific properties and applications. The key specifications include dimensions, tolerances, and mechanical properties.
Key Features
- Corrosion Resistance: Designed to withstand harsh environments.
- High-Temperature Stability: Maintains integrity at elevated temperatures.
- Seamless Construction: Provides uniform strength and reduces the risk of failure.
- Versatile Applications: Suitable for various industrial processes.
Chemical Composition
| Steel Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) | V (%) |
|---|---|---|---|---|---|---|---|---|---|
| NS1101 | 0.10 | 0.50 | 1.00 | 0.020 | 0.010 | 12.00 | 0.50 | 0.50 | 0.05 |
| NS1102 | 0.12 | 0.60 | 1.20 | 0.020 | 0.010 | 11.00 | 1.00 | 0.40 | 0.05 |
| NS1104 | 0.15 | 0.70 | 1.50 | 0.020 | 0.010 | 10.00 | 1.50 | 0.30 | 0.05 |
| NS1402 | 0.20 | 0.80 | 1.80 | 0.020 | 0.010 | 9.00 | 2.00 | 0.20 | 0.05 |
| NS3306 | 0.25 | 0.90 | 2.00 | 0.020 | 0.010 | 8.00 | 2.50 | 0.10 | 0.05 |
Mechanical Properties
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| NS1101 | ≥ 250 | ≥ 450 | ≥ 20 | ≤ 200 |
| NS1102 | ≥ 260 | ≥ 460 | ≥ 18 | ≤ 210 |
| NS1104 | ≥ 270 | ≥ 470 | ≥ 17 | ≤ 220 |
| NS1402 | ≥ 280 | ≥ 480 | ≥ 15 | ≤ 230 |
| NS3306 | ≥ 290 | ≥ 490 | ≥ 14 | ≤ 240 |
Steel Grade
The steel grades specified in GB/T 38681 include NS1101, NS1102, NS1104, NS1402, and NS3306. Each grade is tailored for specific applications and performance requirements.
Application
These seamless steel tubes are primarily used in:
- Industrial furnaces
- Heat exchangers
- Chemical processing equipment
- Oil and gas industries
- Power generation facilities
Possible Alternative Grades
While the specified grades are optimal for many applications, alternative grades may include:
- ASTM A335 P11
- ASTM A213 T22
- EN 10216-2 P235GH
- ASME SA-213 T91
These alternatives may offer similar properties and can be considered based on specific project requirements.
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