Name: ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe
Brand: Yuhong Group Co.,Ltd
SKU: ASTM A335 P91 Pipa tanpa jahitan baja paduan
Price: 1000000 USD
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ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe

Detail produk:

Tempat asal:	Cina
Nama merek:	YUHONG
Sertifikasi:	ISO9001-2008, API 5L, API 5CT, PED, AD-2000, EN10204-3.1B
Nomor model:	ASTM A335 P91 Pipa tanpa jahitan baja paduan

Syarat-syarat pembayaran & pengiriman:

Kuantitas min Order:	Air Dingin Bawaan
Kemasan rincian:	Kotak kayu lapis / Kotak Besi / Bundel dengan tutup plastik
Waktu pengiriman:	7 hari
Syarat-syarat pembayaran:	L/C, T/T

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Detil Deskripsi produk

Nama Produk:	Pipa Seamless Baja Paduan	Standar:	ASTM A335 / ASME SA335
Bahan:	P91, UNS K90901, EN 1.4903	Od:	1/2 "hingga 24" atau besar
WT:	SCH 10s Ke SCH XXS	Panjang:	Acak Tunggal, Acak Ganda & Panjang Potong
Akhir:	Ujung Biasa, Ujung Miring	Jenis:	Mulus
Aplikasi:	Pembangkit Listrik, Petrokimia, Tabung Boiler, Industri Minyak & Gas
Menyorot:	Pipa Mulus Baja Paduan ASTM A335 P91, Tabung Boiler Baja Mulus UNS K90901

ASTM A335 / ASME SA335 P91 Alloy Steel Seamless Pipe for High-Temperature Service

ASTM A335 P91 (UNS K90901 / EN 1.4903) is a high-alloy martensitic steel with ~9% Chromium, Molybdenum, Vanadium, Niobium, and Nitrogen. Designed for boiler tubes and main steam piping, it offers exceptional creep strength up to 620°C and superior oxidation resistance—allowing thinner, lighter walls than traditional low-alloy grades. It is mandatory to use this material in the normalized + tempered condition. Critical warning: It is air-hardening; therefore, all welded joints require strict preheating (200–250°C) and mandatory Post-Weld Heat Treatment (730–760°C) to prevent cracking.

Key Features & Advantages (Why High-Alloyed Grade P91?)

Superior Oxidation Resistance: The ~9% Chromium content provides significantly better resistance to steam-side oxidation and high-temperature flue gas corrosion compared to low-alloy grades (e.g., T22/P22).
High Thermal Stability: Retains strength and structure integrity at extreme temperatures.
Low Thermal Expansion: Lower than austenitic stainless steels (e.g., 304/316), allowing for thinner wall thicknesses and better fatigue resistance under thermal cycling.
Reduced Wall Thickness: Excellent creep strength allows designers to use thinner pipe walls than P22/T22, reducing weight and thermal inertia.

Equivalent Material of ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe

ASTM	ASME	Equivalent material
A335 P 91	ASME SA 335 P91	1.4903, K90901, X10CrMoVNb9-1

Chemical Composition of ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe

Element	Grade	P5	P9	P11	P22	P91	P91 shall also include the following:
Element	UNS	K41545	S50400	K11597	K21590	K91560	P91 shall also include the following:
Carbon		0.15 max	0.15 max	0.05 – 0.15	0.05 – 0.15	0.08 – 0.12	V at 0.18 – 0.25
Manganese		0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	N at 0.030 – 0.070
Phosphorous, max		0.025	0.025	0.025	0.025	0.020	Ni at 0.40 max
Sulfur, max		0.025	0.025	0.025	0.025	0.010	Al at 0.02 max
Silicon		0.50 max	0.25 – 1.00	0.50 – 1.00	0.50 max	0.20 -0.50	Cb at 0.06 – 0.10
Chromium		4.00 – 6.00	8.0 – 10.0	1.00 – 1.50	1.90 – 2.60	8.00 – 9.50	Ti at 0.01 max
Molybdenum		0.45 -0.65	0.90 – 1.10	0.44 – 0.65	0.87 – 1.13	0.85 – 1.05	Zr at 0.01 max

Mechanical Properties of ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe

Grade	Tensile strength(MPa)	Yield strength(MPa)	Elongation(%)	Impact energy(J)	Hardness
P11	≥ 415	≥ 205	≥ 22	≥ 35	≤ 163HB
P12	≥ 415	≥ 220	≥ 22	≥ 35	≤ 163HB
P22	≥ 415	≥ 205	≥ 22	≥ 35	≤ 163HB
P5	≥ 415	≥ 205	≥ 22	≥ 35	≤ 187HB
P91	585~760	≥ 415	≥ 20	≥ 35	≤ 250HB
P92	≥ 620	≥ 440	≥ 20	≥ 35	250HB

Application

A335/SA335 P91 is suitable for bending, flanging (vanstoning), and similar forming operations and for fusion welding. Its commonly used in below usages.

Superheaters & Reheaters (Boiler tubes).
Main Steam Piping and hot reheat piping.
Headers and manifolds in supercritical and ultra-supercritical coal-fired power plants.
Nuclear power heat exchangers.
Petrochemical high-temperature furnace tubes.