HN63MB strip, sheet
Equivalent
| Grade | analogue | W. Nr. | Aisi Uns | En | Order |
|---|---|---|---|---|---|
| HN63MB | EP758U | Buy from stock, view availability |
HN63MB strip, sheet supplier
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Percentage composition GOST 5632−72
| Ni | C | Fe | Cr | Cr | Mn | P | Mo | Si | S |
| Basis | ≤0.02 | ≤0.5 | 20 | 20 | ≤1 | ≤0.015 | 16 | ≤0.1 | ≤0,012 |
Mechanical properties of alloy at a temperature of 20 °C are given below. Alloy density is 8,9 g/cm3. Specific electric resistance is 1,75 microohm-mm2/m. Specific heat is 392J/(kg K). Alloy heat conduction coefficient in a range is 0,126 10² V/(m К). Magnetic inductive capacity is lower than 1,001. Module of elasticity is 20•10-4 MPa. This steel has a good weldability due to its well-balanced chemical composition. It allows manufacturing various constructions without using special processing equipment. Mechanical properties of alloy change depending on a temperature.
Application
Welding structures, building-block modules, details made of this alloy are intended for durable exploitation in oil-refining, gas processing, chemical, oil industries at a temperature 600−850 °C. This alloy is used in manufacturing pipelines of different cross-section, in manufacture of heat interchangers, reservoirs etc. Alloy possesses high resistance to breakage under effect of high temperature. It also has a resistance to plastic deformation and effect of oxidizing environment.
Physical properties in a temperature range of 20−900°С
| 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, К-1 | 9.45 | 9.85 | 10.25 | 10.55 | 10.8 | 10.8 | 11.25 | 11.65 |
Welding
| Type | Description |
| limitedly weldable | welding is possible at heating to 100−120°С and last heat treating |
| hardly weldable | in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, heat treating (annealing) after welding |
| weldable without stint |
welding is done without further heat treating or previous heating |
Sheets made of this steel are welded with a help of automatic, hand electric-arc and argon-arc methods of welding. Sheets of a thickness lower than 10 mm are satisfactorily welded by all methods of hand electric-arc welding. Sheets of a thickness lower than 6 mm are welded by argon-arc method. The same type is used while jointing root seams thicker than 10 mm. Root seams needed to be welded by back-step method with a usage of welding components without niobium for preventive measure purpose of auto-cracks of more than 10 mm. Combined method (an argon-arc welding and a welding with a help of manual electrodes) is used for a sheet with a thickness more than 12 mm.
Thermohardening
At tightened inspections, semi-fabricates should be heat-treated at a temperature of 1000 — 1100ºС with further cooling in water or in the air. Such heat treatment conduces a normalization of inherent stress in alloy and increasing the lasting-quality characteristics of details.
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