1. Material & Standards（材质与标准）

• Material: Carbon Steel

• Grades: STK400

• Standards: JIS G3444

• Type: ERW (Electric Resistance Welded)

• Coating/Finish: Black Painted or Hot-Dip Galvanized Optional

2. Key Specifications（主要规格参数）

• Size Range: 21.7mm to 610mm (DN20 to DN600)

• Wall Thickness: 2.0mm to 16.0mm or Custom

• Pressure Rating: Suitable for Industrial & Structural Applications

• Length: Standard 6m / 12m or Custom Length

• Surface Protection: Black Paint or Galvanized

3. Features & Benefits（特点与优势）
✔ Durable & Strong – STK400 material ensures excellent mechanical properties
✔ Reliable ERW Construction – Uniform wall thickness and smooth surface
✔ Corrosion-Resistant Options – Black painting or hot-dip galvanization for outdoor use
✔ Easy Installation – Standardized sizes simplify structural and industrial applications

4. Applications（适用范围）

• Industrial Piping Systems

• Structural Steel Fabrication

• Water & Gas Distribution Pipelines

• Construction and Infrastructure Projects

5. Certifications（认证）

• Mill Test Certificate (MTC)

• ISO 9001 Certified

• Hydrostatic & Ultrasonic Tested

Frequently Asked Questions (FAQ)

1. Are you a manufacturer or trading company?
We are a manufacturer with our own factory located in Hebei, China.

2. What materials do you offer?

• Stainless Steel: 304, 304L, 316, 316L, 321, etc.

• Carbon Steel: ASTM A105, ASTM A350 LF2, Q235, Q345, etc.

• Alloy Steel: ASTM A182 F11, F22, F5, etc.

3. Which standards do your products comply with?
ASME B16.5, ANSI, ASTM, DIN, JIS, EN, GB — with third-party inspection available.

4. Do you support OEM/ODM customization?
Yes, we provide custom machining, coating, marking, and packaging based on your drawings.

5. What is your minimum order quantity (MOQ)?
MOQ is typically 1 piece for standard items; customized parts may vary.

6. Do you provide free samples?
Yes, free samples for standard sizes are available; buyers cover shipping cost.

7. What is your delivery time?

• In-stock: 3–5 working days

• Bulk/custom orders: 10–25 working days

8. How do you ensure product quality?
We perform full inspection: raw material verification, dimensional checks, pressure/leak tests, and surface finish inspection. Third-party testing is available upon request.