Alloy KHN38VT (ЭИ703)
|Designation GOST Cyrillic||ХН38ВТ|
|Designation GOST Latin||XH38BT|
|By chemical elements||CrNi38ВTe|
|Designation GOST Cyrillic||ЭИ703|
|Designation GOST Latin||EI703|
|By chemical elements||-|
Alloy KHN38VT used: for the production of cold-rolled strip; hot-rolled steel plate; solid-rolled rings for different purposes; parts for gas systems, sheet metal parts operating at moderate voltages and loads; welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes.
Heat-resistant and heat-resistant alloy of iron-Nickel basis.
The recommended maximum operating temperature for a long time +1000 °C. the Temperature of intensive scaling in air +1050 °C.
Recommended for replacement of high-temperature alloy KHN78T.
|Sheets and strips||В23||GOST 19904-90|
|Sheets and strips||В33||GOST 24982-81, TU 14-1-146-71, TU 14-1-1747-76, TU 14-1-2114-77, TU 14-1-5103-92|
|Classification, nomenclature and General rules||В30||GOST 5632-72|
|Processing of metals by pressure. Forgings||В03||OST 1 90110-73, TU 14-1-1530-75, TU 14-1-2902-80, TU 14-1-2918-80|
|Bars and shapes||В32||OST 1 92049-76, TU 14-1-476-72, TU 14-11-245-88|
|Blanks. Of the workpiece. Slabs||В31||OST 3-1686-90, OST 1 90159-92, OST 1 90345-83, OST 1 90398-91, TU 14-1-1214-75|
|Welding and cutting metals. Soldering, riveting||В05||TU 14-1-997-74, TU 14-1-997-2012|
According to TU 14-1-2902-80 the chemical composition is given for ХН38ВТ, ХН38ВТ-Ш.
According to TU 14-1-997-74, the alloy has the marking ХН38ВБ (ЭИ703Б), if in accordance with the order niobium Nb = 1,20-1,70% is introduced instead of titanium.
According to TU 14-1-1747-76 the chemical composition is given for ХН38ВТ and ХН38ВТ-ВД.
According to TU 14-1-2918-80 the chemical composition is given for ХН38ВТ.
According to TU 14-1-927-74 the chemical composition is given for ХН38ВТ. The deoxidizers (cerium, calcium, barium) are introduced into the metal by calculation and chemical analysis is not determined. At the request of the consumer, instead of titanium, niobium is introduced in the range 1.20-1.70%, in which case the alloy is marked EI703B.
According to TU 14-1-476-72 the chemical composition is given for ХН38ВТ. It is allowed to deoxidize with cerium, which is introduced into the metal by calculation in an amount of 0.050% and is not determined by chemical analysis. The content of residual elements is according to GOST 5632.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %||y, %|
|Cold-rolled steel strip of 0.2-1.2 mm on the other 14-1-927-74. Quenching in water or air with 1100-1140 °C|
|Steel cold-rolled sheet (0.8 to 3.9 mm) and HR (2.0 to 11.0 mm) in the delivery state according to GOST 24982-81 (quenching in water, under a water shower or air)|
|Forgings. Quenching in water or air with 1120-1160 °C|
|Bars on the other 14-1-476-72. Quenching in water or air with 1120-1160 °C|
Description mechanical marks
|sT|s0,2||Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%|
|σU||Limit short-term strength|
|d5||Elongation after rupture|
|y||The relative narrowing|
|Macrostructure and pollution||The macrostructure of the alloy should not have shrinkage and looseness, bubbles, cracks, inclusions, delaminations, and placenow.|