Steel XH78T refers to the high-temperature heat-resistant grades, due to high content of nickel is formed on the surface of a solid oxide film, whose presence otherwise GOST 14 162−79. At t ° 1100 ° C the oxidation rate is 0.2 mm per year. XH78T used for the production of lightly loaded components operating at t ° to 1100 ° C. The disadvantages include instability XH78T among the sulfur compounds, resulting in embrittlement.
XH78T Alloy Chemical composition (in%)
XH78T alloys are widely used modern industry. It serves as the basis for the manufacture of capillary tubes — minimum diameter thin-walled tube is lightweight and high strength. They are usually round, at least — a profile cross-section: rectangular, square or oval. They are indispensable in aviation, engineering, oil and gas industry, medicine.
|Outer diameter (mm)||Wall thickness (mm)||The length of the pipe||rationing|
|0.3 — 120||0.08 to 5||off-gage (0.3m — 7m), measuring (4 — 7m), multiple dimensional, (4 m with an allowance of 5 mm), in coils (up to 160 m||A normalization of the mechanical properties and chemical composition; B valuation, only the chemical composition; The valuation only the mechanical properties.|
Tolerances: if the internal Ø 0,6 mm or more, the internal diameter tolerances shall not exceed the deflection at the outer diameter of the pipe by more than 0.01 mm. The capillary tube may be made with the combined tolerances, ie. E. A higher accuracy (OD) or a single-precision (pipe wall thickness). The curvature of the tube must be within 3 mm per 1 m. The surface of the tubes must be clean and smooth, without the presence of signs of deformation, dents, divorces, and so on. D. With a diameter of more than 1.6 mm ends of the tubes are cut and processed. With Ø 1.6 mm ends are cut off. Tube compulsorily subjected to cleansing the air jet pressure of 0.49 MPa.
- Ultimate — up to 880 MPa
- Elongation — 35%
- Density — 8,4 g / cm3
In agreement with the buyer XH78T tubes must withstand flattening, bend and be tested for leakage at a pressure of from 0.59 to 0.78 MPa. The disadvantages are the high cost of the tube XH78T because of the expensive nickel. But, durability, reliability, recyclability of the material — make it highly profitable.
|t °||E 10 — 5||a June 10||Heat capacity||Density|
|hail||MPa||1 / Grad||W / (m · deg)||g / cm 3|
Due to its high resistance to aggressive influences, XH78T pipe is widely used in the production of paints and varnishes, fertilizers and other materials, which contain the «aggressive» components. Chromium increases the resistance of the alloy XH78T to corrosion, so the pipe demand in construction for laying water pipes. The smooth surface tube XH78T allows their use in pharmaceutics. Due to the heat resistance, the tube quite frequently applied in aircraft at operating temperatures up to 1100 ° C. It also serves for the manufacture of shells of industrial thermometers and thermocouples.
Buy at the best price
In stock «Electrovek-steel» company offers a wide range of brand products XH78T standard and custom settings. Prices are due to the technological features of production without including additional costs. Terms of realization of orders are minimal. Wholesale customers receive discounts.