Black Seamless Pipe

QS Pipe: Yancheng Black Seamless Pipe

ASME black seamless pipe in A335 P22, 1/8 to 48 inch SCH40, black surface, for gas, water and oil transport in industrial piping.

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One-Minute Overview

Black seamless pipe in A335 P22, covering 1/8 to 48 inch in SCH40 wall.
Black paint surface is the shop finish that protects the pipe in transit.
Seamless body, so no weld seam sits in the pressure boundary.
Carries gas, water, oil and other media in general industrial piping.

Black seamless pipe is the everyday seamless tube with a black paint surface, ordered when the line carries gas, water, oil or similar media and the project does not ask for a plated or polished finish. This item runs in A335 P22 from 1/8 to 48 inch with a SCH40 wall under the ASME designation, so one material covers small instrument take-offs right up to large transmission runs. The black surface is applied at the works, keeps handling marks down and gives a clean base for whatever coating the service requires later.

Name: Black Seamless Pipe
Type: Seamless
Size: 1/8 to 48 Inch
Schedule: SCH40
Material: A335 P22
Standard: ASME
Surface: Black
Application: Transportation of Gas, Water, Oil and Other Media in Industries
Size, schedule and material are confirmed per inquiry, and a detailed specification sheet is available on request.

The wide size range is the point of ordering this item: one material and one schedule cover small-bore branches and large-bore mains on the same project, which keeps the material take-off simple. Check the wall against the design code at the largest sizes, because SCH40 means very different walls at 1/2 inch and at 48 inch. The black paint is a handling finish, not a corrosion barrier, so buried or wet service still takes a proper coating system after the pipe is strung and welded.

Handling and fit-up follow normal seamless practice: square cuts, bevels per the welding procedure, and alignment before the root pass. Store the pipe on dunnage with ends capped, keep the black surface dry, and repair transport scuffs before coating. Inspection records tie each length to its heat number, hydrostatic testing confirms the joints, and NDT can be added where the fluid or the code calls for it.

FAQ

Q1. How can one pipe cover 1/8 to 48 inch and still be the same product?

Same material, same manufacturing route, only the outside diameter and wall change across the range. That is useful in a plant, because branches and mains can share one material certificate and one set of welding procedures instead of juggling a short list of odd sizes.

Q2. Will the black paint protect my line outdoors?

Not on its own. It is a handling and storage finish that keeps the surface uniform until the real coating goes on. For outdoor or buried service, plan a coating system over it, and touch up scuffs first so the coating starts on a sound base.

Q3. A335 P22 sounds like power plant steel, so can it really just carry water?

It can carry water, oil and gas without complaint. The grade is a robust alloy with chromium and molybdenum, so you get strength and some corrosion reserve. Using it for utility lines is a bit like taking a lorry to the corner shop, but it works.

Q4. What payment terms do you accept for black seamless pipe orders?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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