High Temperature Pipe

QS Pipe: Fujian High Temperature Pipe

High temperature pipe in A106 carbon steel and A335 alloy grades for steam, heater and hot process lines, 1/2 to 24 inch and Sch 40 to XXS.

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One-Minute Overview

High temperature pipe in carbon steel and chrome-moly alloy grades.
Sizes 1/2 to 24 inch, schedules Sch 40 to XXS, seamless construction throughout.
Grade is picked from the design metal temperature and the fluid.
Common on steam systems, heaters, boilers and hot process piping.

High temperature pipe is not one product; it is a selection problem. At moderate elevated temperature a carbon steel grade like A106 Gr.B or Gr.C carries steam and hot water well. As the metal gets hotter, strength and oxidation resistance start to fade, and chromium-molybdenum grades take over — A335 P11 and P22 in the middle band, P91 where pressures and temperatures peak. Picking the grade balances design temperature, corrosion allowance, weldability and cost. Sizes across the range run 1/2 to 24 inch in Sch 40 to XXS walls, seamless so there is no weld seam to creep open under thermal cycling.

Name: High Temperature Pipe
Type: Seamless
Size: 1/2-24 Inch
Schedule: Sch 40-XXS
Material: A106 Gr.B/C, A335 P11, P22, P91
Standard: ASTM A106 / ASTM A335
End: Plain End or Bevel End
Feature: Grades matched to elevated temperature duty
Sizes, wall thicknesses and schedules are confirmed per inquiry, and a detailed specification sheet is available on request.

Temperature works on pipe in two ways: it lowers strength and it accelerates oxidation and internal corrosion. Carbon steel handles many hot utilities, but its creep margin thins as metal temperature climbs, and long service at the top of its band can mean graphitisation and wall loss. Alloy grades answer with chromium for oxidation resistance and molybdenum for creep strength, so the wall can stay thinner at the same pressure. The design code sets the allowable stress at temperature; the grade you order has to meet the metal temperature the line will actually see in operation, including upsets.

Fabrication follows the grade. Carbon steel high temperature pipe welds conventionally with preheat where wall thickness demands it; chrome-moly grades need matching consumables, controlled preheat and post-weld heat treatment to keep the heat affected zone ductile. Inspect with hydrostatic testing at minimum and add ultrasonic or radiographic examination where the service is critical, and record positive material identification on alloy heats before welding. Store tubes capped and dry, protect bevels, and keep grades segregated on the rack so the right grade reaches the right line.

FAQ

Q1. Which grade family suits high temperature service?

Start with the design metal temperature. Carbon steel grades like A106 cover moderate elevated temperature; A335 P11 and P22 add chromium and molybdenum for creep and oxidation resistance in hotter steam and heater duty; P91 serves the highest pressure and temperature. The fluid chemistry and the code narrow the choice further.

Q2. Can I upgrade the grade later, or is it fixed at design?

Fix it at design if you can. Upgrading the line later means new material, new welding procedures and often new stress calculations. If the operating temperature might climb, choose the alloy grade now — the pipe costs more per tonne and far less than a re-pipe.

Q3. What happens if carbon steel sits too hot for too long?

It gets old. Strength drops, creep sets in, and the microstructure can degenerate over years of service — sometimes with wall loss, sometimes with a brittle surprise at a weld. Staying inside the grade temperature band is the boring, reliable answer.

Q4. What's the minimum I can order?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Kits made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

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