Practical guides on materials, standards and buying pipe fittings from China.
From inquiry to delivery: specifications, quotations, payment terms, quality control, shipping documents and the practical details first-time importers ask about.
Read article →WPB and WPL6 look like sister grades but serve different temperature ranges. Impact testing, matching flanges, price difference and how to avoid a costly mix-up.
Read article →Raised face, flat face and ring type joint flanges compared — sealing principle, gasket choice, pressure classes and when each face type is required.
Read article →Concentric reducers keep the centerline aligned; eccentric reducers keep one side flat. The pump suction rule, FOT vs FOB orientation, and ordering tips.
Read article →From seamless pipe to finished ASME B16.9 elbow: cutting, hot mandrel pushing, heat treatment, machining and inspection — explained step by step.
Read article →A practical walkthrough of an EN 10204 3.1 certificate: heat number, chemical composition, mechanical properties — and the red flags that reveal a fake.
Read article →Seamless fittings are formed from seamless pipe; welded fittings from plate or welded pipe. How to choose, why large sizes are always welded, and what it means for price.
Read article →LR elbows have a bend radius of 1.5× the pipe size, SR elbows 1×. Here's how the difference affects flow, space and price — and how to order correctly.
Read article →What pipe schedules mean, how SCH40 and SCH80 differ, and the STD/XS trap on large diameters that catches out many buyers.
Read article →Both are carbon steel, but A234 WPB is for butt-weld fittings while A105 is for forged flanges and small fittings. Here's how to specify the right one.
Read article →Send us your specifications — product, size, schedule, material and quantity. We reply within 24 hours with factory-direct prices.