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HN30MDB alloy


Grade analogue W. Nr. Aisi Uns En Order
XN30MDB EC77 Buy from stock, view availability

Technical characteristics

Alloyed steel can be broken down into 3 categories: 1) constructive, 2) toolroom, 3) high quality with special physical and chemical properties. Alloy of grade HN30MDB relates to the last category. It is a heat-resistant high-alloyed steel. Compositions consists of nickel (29−31%), chrome (27−29%). Silicon (about 0,2%), mangan (0,5−1,8%), niobium (up to 0,2%), copper (up to 1,5%), phosphorus and sulphur (up to 0,02%) should be added in the capacity of masteralloys. Jumping-up temperature of mill-products is 1170 °C at the beginning; in the end it is 850 °C. Finished products (f.e. pipes) with a cross-section of <350 mm are cooled in air. Steel pipe of HN30MDB grade basically is manufactured in a form of round cross-section. Made to order pipes are manufactured in a form of oval, rectangular or square section.

Percentage composition of the alloy GOST 5632−72

Alloy Cr Ni C Mn Fe Mo Nb Cu Si B P S
HN30MDB 19−22 29−31 ≤0,02 0.5−1.8 34−40 2.8−3.5 0.05−0.2 0.9−1.5 ≤0,2 ≤0,001 ≤0,02 ≤0,02

Alloying produces multidimensional effect on a steels quality. Chrome increases hardness and resistant to corrosion. Nickel confers plasticity; wolframium confers hardness, red-hardness. Vanadium increases strength, resistance to impact loads and wipe out; cobalt raises heat-resistance, magnetic permeability. Molybdenum confers red-hardness, strength, resistance to corrosion at a high temperature. When a quantity of mangan is more than 1%, it increases impact index and wearing qualities. Titanium increases stability, corrosive resistance; aluminium raises resistance to oxide scale formation; niobium increases acid-resistance. Cuprum raises plasticity, prevents action of rust. Extra-qualitative steel contains borium, zirconium except for above-said components.

Pipe manufacture

HN30MDB pipes are classified by a diameter and by a thickness of walls. Very thin pipes have Ø of 5−250 mm and wall thickness of 0,3 — 6 mm. Thin pipes have Ø of 5−250 mm and wall thickness of 0,6 — 20 mm. Thick-walled pipes have Ø of 6 — 250 mm, wall thickness of 1,6 — 24 mm. Very thick-walled pipes are manufactured with a diameter of 6 — 70 mm, and wall thickness of 2 — 12 mm. Thermohardening should be done at a temperature of 1000 — 1100ºС with further cooling in water or in air at increased structural requirements. It conduces to normalization of inherent stress in a material and to increasing of strength characteristics of details.

Advantages of alloy

HN30MDB grade is a heat-resistant steel, that has a resistance to corrosion. It can work in aggressive environment at temperature <1000°C. An oxidizing rate is 0,02 mm/h in a free atmosphere at a temperature of 800°C. Such a steel lends itself to mechanical treatment satisfactorily. It is a long-life, reliable, aesthetic steel. By virtue of this, it is much-in-demand in spheres of national economy. This mallable material possesses resistance to aggressive environment. Its surface is not oxidized at durable exploitation or at a high temperature. The main demerit is its high cost because of expensiveness of main components (nickel, chrome).


Pipes of HN30MDB grade are used in reduced and increased pressure environment (f. e. in pipelines for supply of water, oil, gas). Such pipes are widely utilized in nuclear, chemical industries, in various furnaces, boilers; in manufacture of furnace conveyor, carburizing box; in mechanical engineering for manufacturing detail that are exploited on load. Welding structures, building-block modules made of this alloy are intended for durable exploitation in oil-refining, gas processing, chemical, oil industries at a temperature <1000 °C. This alloy is used not only in manufacture of pipelines of different cross-section, but in manufacture of heat interchangers, reservoirs etc. as well.

Buy at a bargain HN30MDB alloy price

You have to take into account a range of factors when choosing heat-resisting mill-products. You can find the widest selection of goods made of this steel and buy HN30MDB alloy on the most favourable terms in HN30MDB alloy supplier. Buy HN30MDB alloy right now! HN30MDB alloy price from HN30MDB alloy supplier is conditioned by technological details of production without including additional expenses. There is the best HN30MDB alloy price from HN30MDB alloy supplier. Our specialists are always ready to help when selecting the required products. These products determine capability and reliability of a future equipment. We guarantee a high quality of products and a timely delivery. Phone numbers, e-mail addresses of the closest company’s office you can find in «Contacts» section. By virtue of this, you can easily buy HN30MDB alloy. Order a service «Call-back» and our manager will help you to choose products that will fit your individual requirements. Buy HN30MDB alloy in a moment! We offer beneficial HN30MDB alloy price from HN30MDB alloy supplier for regular customers.