EN 10253-2 Type B Buttweld Pipe Fittings: A Complete Introduction

Arshya Pipe Fittings infographic comparing EN 10253-2 Type A and Type B buttweld pipe fittings, explaining differences in wall thickness, pressure rating, applications, and EN standard compliance for industrial piping systems.

If you specify or procure pressure piping components for the European market, you have almost certainly come across EN 10253-2 — the CEN standard that governs butt-welding steel fittings made from non-alloy and ferritic alloy steels. Within this standard, fittings are classified into two types, A and B, and the difference between them is not cosmetic. It directly affects the pressure rating you can safely design around.

This article introduces EN 10253-2 Type B fittings: what makes them different from Type A, which steel grades fall under this standard, and where they are typically specified. Read the full technical breakdown on our website: arshyapipefittings.com.

What EN 10253-2 Covers

EN 10253-2 is Part 2 of the EN 10253 series of European standards for butt-welding pipe fittings. It specifies the technical delivery requirements for seamless and welded elbows, tees, reducers, and caps made of carbon and alloy steel, manufactured for pressure applications at room temperature, low temperature, and elevated temperature, and used in the transmission and distribution of fluids and gases. The standard covers chemical composition, mechanical properties, dimensions and tolerances, inspection and testing requirements, marking, and packaging.

Type A vs Type B: The Core Difference

Type A — Butt-welding fittings with a reduced pressure factor. The wall thickness at the welded ends and across the body of the fitting matches that of a straight pipe of the same nominal thickness. Because of this, a Type A fitting's resistance to internal pressure is generally lower than a straight pipe of identical dimensions.

Type B — Butt-welding fittings rated for full-service pressure. The body of the fitting is manufactured with increased wall thickness so that it can withstand the same internal pressure as a straight pipe of the same dimensions. Any excess thickness at the welding ends is machined down to match the connecting pipe.

In short: Type B is the version to specify wherever the piping system is designed to run at full pipe-rated pressure, without a pressure de-rating factor applied to the fitting.

Where Type B Fittings Are Used

Because they carry the full pressure rating of the connected pipe, EN 10253-2 Type B fittings are widely specified in:

  • Oil and gas transmission and process piping
  • Petrochemical and refinery pressure systems
  • Power generation and steam piping
  • Water and utility distribution networks

— wherever welding quality, dimensional accuracy, and full pressure integrity at the fitting are non-negotiable.

Typical Steel Grades

EN 10253-2 fittings are produced in carbon and low-alloy steel grades including P235GH, P265GH, P355NH, 16Mo3, 13CrMo4-5, and L450QB, each carrying its own specified yield strength and heat-treatment condition, denoted by the P (pressure application), H (hollow section), and G (general characteristics) designation letters used across EN pressure-equipment standards.

Sourcing EN 10253-2 Type B Fittings from Arshya Pipe Fittings

Arshya Pipe Fittings manufactures and exports buttweld pipe fittings under ISO, PED, IBR, U Stamp, and AD 2000 certifications, with EN 10253-2 Type B among the grade families we regularly supply to engineering and procurement teams in oil and gas, petrochemical, and power generation. You can explore our full EN Grades range — covering carbon steel, alloy steel/CrMo, stainless, nickel alloys, LTCS, and pipeline grades — on our website.

Visit arshyapipefittings.com to view our EN Grades section and request a quotation.

This is the first article in our EN 10253-2 content series. Future posts will cover dimensional tolerances, pressure de-rating tables for Type A fittings, and a grade-by-grade comparison for elevated-temperature service.

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