.F91/X10CrMoVNb9-1, 1.4903 - Boiler steel
X10CrMoVNb9-1 and equivalent P91 / T91, F91 are high-alloy species designed to work at elevated temperatures with a martensitic structure. The most common ones in the form of seamless pipes, bars, sheets or forged elements are used in the production of installations, pipelines, boilers and other components of power equipment operating at temperatures of 540-580C.
X10CrMoVNb9-1 steel is becoming more and more popular due to much better mechanical properties, resistance to creep, corrosion, impact resistance and thermal fatigue. In contrast to the well-known, proven boiler species, 1.4903 should be classified as high-alloyed heat-resistant boiler steel due to the increased content of Chromium, Molybdenum, and small amounts of Vanadium and Niobium.
It's price in relation to standard grades such as 14MoV6-3 is certainly higher, however, along with the price, the length of service life and higher material durability also increases.
1.4901 / X10CrWMoVNb9-2 / 92 is an improved version of the P91 / T91 / F91 material with a 2% addition of Tungsten, a slightly increased amount of Chromium, and a reduced content of Molybdenum, characterized by a creep resistance at temperatures of up to 600C higher by about 1/3. The material has even higher corrosion resistance and weldability. It is used at the highest operating temperatures up to 650C.
Grade 91/92 - Steel used for production of boiler components with supercritical and ultra-critical parameters - jackets, connectors for steam superheater outlet chambers, superheated steam superheaters, turbine shaft parts, chambers and pipelines for fresh and superheated steam, superheater coils, steam collectors, outlet collectors, fittings and sleeves for the installation of boilers, connectors, pipelines of modern power units operating at temperatures of approximately 550-640C and steam pressures of approx. 18-30 MPa.
F91 (X10CrMoVNb9-1), IS AN ALLOY STEEL WITH CHROME AND AN ADDITION OF NB, WHICH HAS ELEVATED MECHANICAL CHARACTERISTICS AND IT IS VERY OFTEN USED IN THE CHEMICAL AND PETROCHEMICAL INDUSTRIES FOR THE FABRICATION OF FLANGES, VALVES, TUBES AND FOR EQUIPMENTS THAT REQUIRE AN EXCELLENT CREEP RESISTANCE AND TO EMBRITTLEMENT BECAUSE OF HYDROGEN UNDER PRESSURE AND AT AN ELEVATED TEMPERATURE (UP TO 600°C).

CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS

DN15-DN3000
Maximum weight 6tons
25,000tons production annual year

ANSI B16.5,ANSI B16.47 Series A&B,ANSI B16.48,ANSI B16.36
API 605,API 16D,API 17D
BS4504,BS3293
DIN
AS
EN1092-1
GOST
EEMUA145