logo

Yuhong Holding Group Co., LTD

Dom
O nas
Wycieczka po fabryce
Kontrola jakości
Skontaktuj się z nami
Wiadomości Firmowe
Dom ProduktyRura ze stali stopowej

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

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

  • ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe
  • ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe
  • ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe
ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe
Szczegóły Produktu:
Miejsce pochodzenia: Chiny
Nazwa handlowa: YUHONG
Orzecznictwo: ISO9001-2008, API 5L, API 5CT, PED, AD-2000, EN10204-3.1B
Numer modelu: ASTM A335 P91 Rura bezszwowa ze stali stopowej
Zapłata:
Minimalne zamówienie: 500kg
Szczegóły pakowania: Sklejkowa skrzynka drewniana / żelazna skrzynka / pakiet z plastikową nasadką
Czas dostawy: 7 dni
Zasady płatności: Akredytywa, T/T
Kontakt
Szczegółowy opis produktu
Nazwa produktu: Bezszwowa rura ze stali stopowej Standard: ASTM A335 / ASME SA335
Tworzywo: P91, UNS K90901, EN 1.4903 Od: 1/2 „do 24” lub duże
WT: SCH 10s Do SCH XXS Długość: Pojedynczy losowy, podwójny losowy i długość cięcia
Koniec: Zwykły koniec, skośny koniec Typ: Bezszwowy
Aplikacja: Elektrownia, petrochemia, rura kotła, przemysł naftowy i gazowy
Wysokie światło: Rura bez szwu ze stali stopowej ASTM A335 P91, rura kotła ze stali bez szwu 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:
UNS K41545 S50400 K11597 K21590 K91560
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.

  1. Superheaters & Reheaters (Boiler tubes).

  2. Main Steam Piping and hot reheat piping.

  3. Headers and manifolds in supercritical and ultra-supercritical coal-fired power plants.

  4. Nuclear power heat exchangers.

  5. Petrochemical high-temperature furnace tubes.

 

 

ASTM A335 / ASME SA335 UNS K90901 P91 Boiler Tube EN 1.4903 Alloy Steel Seamless Pipe 0

 

Szczegóły kontaktu
Yuhong Group Co.,Ltd

Osoba kontaktowa: Vivi

Tel: 0086-13023766106

Faks: 0086-574-88017980

Wyślij zapytanie bezpośrednio do nas (0 / 3000)