HN58 W alloy
Alloys consists of two or a few chemical components, at least one of which is a metal. Heat-resisting stainless alloys are metallic materials. They possess high resistance to bearing failure at high temperatures and oxidizing environment.
Chemical composition of alloy
|≤0,015||≤0,8||Basis||≤1||39 — 41||≤0,012||0.5 — 1.5||≤0.15|
Qualities of HN58 W grade change depending on an operating temperature. At 20 °C, density is 8,1 g/cm³, specific electric resistance is 1,18 Ohm-mm2/m, specific heat is 375 J/(kg-K). Heat conduction coefficient is about 0,126 10² V/(m К). This steel has a good weldability due to balanced chemical composition. It allows making constructions without using complex processing equipment and without heat treatment after welding.
HN58 W pipes are classified by a diameter and by a thickness of walls. Very thin-walled pipes have Ø of 5−250 mm and wall thickness of 0,3 — 6 mm. Thick-walled pipes have Ø of 5−250 mm at thickness of 0,6 — 20 mm. Thin-walled pipes have Ø of 0,6 — 25 cm at thickness of 0,16 — 2,4 cm. Very thick-walled pipes have Ø of 0,6 — 7,0 cm, and thickness of walls 0,2 — 1,2 cm. Thermohardening performs at a temperature of 1000 — 1100ºС with further cooling in water or in air for increase of structural requirements. It conduces to normalization of inherent stress in a material and to increasing of strength characteristics of details.
Welding constructions, assembly modules, details made of HN85 W steel are intended for long-term exploitation in chemical, oil-, gas-processing industry, and energetics at a temperature of <850ºС. This steel is used in manufacture of heat exchangers, special tanks, pipe-arrangements of different cross-sections.
Value of linear expansion thermal coefficient α
|t°||20 — 100°С||20 — 200°С||20 — 300°С||20 — 400°С||20 — 500°С||20 — 600°С||20 — 700°С||20 — 800°С||20 — 900°С|
|α 106,0 К-1||10.4||10.8||10.95||11.55||11.9||12.3||12.85||12.9||13|
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