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Equal and Reducing Butt-welding Tee Cross Pipe Fitting Manufacturers in China - Quality Supply from Factory
Material Grade
⚙️
Carbon Steel
ASTM A234 WPB, WPC; ASTM A420 WPL9, WPL3, WPL6
🔩
Stainless Steel
ASTM A403 WP304/304L, WP316/316L, WP321, WP347
🛠️
Alloy Steel
ASTM A234 WP1, WP12, WP11, WP22, WP5, WP9, WP91; Duplex & Super Duplex Stainless Steel; ASTM A815 UNS S31803, UNS S32750, UNS S32760
Surface Treatment
- 🛡️ Anti-rust Oil
- 🎨 Black Paint
- ⚡ Electric Galvanized
- 🔥 Hot-dip Galvanized
Frequently Asked Questions
Q
What is the difference between ASTM A234 WPB and WPC carbon steel fittings?
ASTM A234 WPB and WPC are both carbon steel pipe fitting grades. WPB is the most common grade with a minimum tensile strength of 60,000 psi, while WPC has a higher minimum tensile strength of 70,000 psi, making WPC more suitable for higher-pressure applications.
Q
What is the difference between WP304 and WP304L stainless steel?
WP304 and WP304L are both austenitic stainless steel grades. The key difference is the carbon content — WP304L has a lower carbon content (max 0.03%), which reduces the risk of carbide precipitation during welding, making WP304L preferred for welded applications.
Q
When should Duplex or Super Duplex stainless steel be used?
Duplex (UNS S31803) and Super Duplex (UNS S32750, UNS S32760) stainless steels are ideal for highly corrosive environments such as offshore oil and gas, chemical processing, and seawater applications. They offer significantly higher strength and better corrosion resistance compared to standard austenitic stainless steels.
Q
What is the purpose of hot-dip galvanizing as a surface treatment?
Hot-dip galvanizing involves immersing the steel fittings in molten zinc to form a thick, metallurgically bonded zinc coating. This provides long-lasting corrosion protection and is commonly used for fittings exposed to outdoor or harsh environments.
Q
What is the difference between electric galvanizing and hot-dip galvanizing?
Electric galvanizing (electroplating) deposits a thinner, more uniform zinc layer using an electrical process, providing a smoother surface finish suitable for indoor or mild environments. Hot-dip galvanizing produces a thicker, more durable coating ideal for heavy-duty outdoor corrosion protection.
Q
Which alloy steel grade is recommended for high-temperature service?
For high-temperature service, ASTM A234 WP11 (1.25% Cr, 0.5% Mo), WP22 (2.25% Cr, 1% Mo), WP9 (9% Cr, 1% Mo), and WP91 (9% Cr, 1% Mo with additional alloying) are commonly recommended. WP91 in particular is widely used in power generation applications requiring elevated temperature and creep resistance.