**1. What is ST37 pipe material?**
ST37 is a carbon steel material specified under the German standard **DIN 17100**. It is a non-alloy structural steel with a minimum tensile strength of 370 MPa (hence "37" in the name). ST37 pipes are commonly used in general construction, machinery, and low-pressure applications due to their good weldability and formability.
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**2. What is ST37 steel grade?**
ST37 is a grade of mild carbon steel under the **DIN 17100** standard. The "ST" stands for *Stahl (Steel)*, and "37" denotes its minimum tensile strength of 370 MPa. It is a non-alloy steel with moderate strength, suitable for structural components, pipes, and parts requiring cold-forming or welding.
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**3. What is Type E steel pipe?**
"Type E" typically refers to **electric-resistance welded (ERW) steel pipe** under standards like **ASTM A53**. For example, ASTM A53 Type E designates pipes made by the ERW process. These pipes are used for mechanical and pressure applications, as well as for ordinary uses in steam, water, and gas lines.
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**4. What material is ST37.4 made of?**
ST37.4 is a variant of ST37 specified in **DIN 1629 Part 4** for seamless steel tubes. It has a similar composition to standard ST37, with typical elements:
- **Carbon (C):** ≤0.17%
- **Manganese (Mn):** 0.35–0.65%
- **Silicon (Si):** ≤0.40%
- **Phosphorus (P):** ≤0.045%
- **Sulfur (S):** ≤0.045%
It is used for pressure vessels, boilers, and mechanical engineering applications.
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**5. What is the ASTM equivalent to ST37?**
The closest **ASTM equivalent** to ST37 is **ASTM A36**, a general-purpose carbon steel with similar mechanical properties (yield strength: 250 MPa, tensile strength: 400–550 MPa). For pipes, ST37 is often compared to **ASTM A53 Grade B** (ERW/seamless) or **ASTM A283 Grade C**, depending on the application. Note: Exact equivalence depends on specific requirements like chemical composition and testing standards.
