DIN 17175 10CrMo910 seamless steel tubes

DIN 17175 10CrMo910 seamless steel tubes are designed to withstand high temperatures and high pressures, making them suitable for use in applications where extreme conditions are present. The tubes are made using high-quality raw materials and are subjected to rigorous testing to ensure their durability and strength. The tubes have a smooth surface finish, excellent chemical and mechanical properties, and are resistant to corrosion and oxidation. Additionally, they are highly reliable and require minimal maintenance, making them ideal for use in critical applications such as power plants, refineries, and petrochemical industries.

DIN 17175 10CrMo910 belongs to 2.25Cr-1Mo pearlitic heat-resistant steel, which has good physical and chemical properties and process properties, low heat treatment sensitivity, high heat strength and metallographic structure stability in long-term use at high temperature.

Equivalent Steel Grade

DIN 17175 10CrMo910 Seamless Steel Tubes can be used to manufacture steam boilers, pipes, pressure vessels and instruments operating at temperatures up to 600 ° C and at high temperatures.

Heat treatment temperature of DIN 17175 10CrMo910 seamless steel tubes

Chemical composition of DIN 17175 10CrMo910 seamless steel tubes

Mechanical property of DIN 17175 10CrMo910 seamless steel tubes

Welding properties of DIN 17175 10CrMo910 seamless steel tubes

When DIN 17175 10CrMo910 alloy steel pipe is welded, if the welding rod and welding wire with the same strength as the base metal are selected, the plasticity of the welding joint obtained is poor, the preheating temperature is required to be 400-450 ℃, the preheating temperature is high, and the construction conditions are poor; in order to improve the plasticity of the welded joint, it is necessary to conduct 740 ℃ heat preservation for 3h high temperature tempering after welding. However, high temperature preheating and high temperature tempering for a long time will cause obvious softening of the HAZ.

If the electrode and welding wire with slightly lower strength and better plasticity are selected, the preheating temperature will be greatly reduced (actual operation 250-300 ℃), the high temperature tempering temperature will also be reduced, the tempering treatment time will be shortened, and 700-720 ℃ will be kept for 1H for tempering, which is enough to eliminate the welding stress and will not cause the softening of the heat affected zone of welding. Therefore, r317 electrode and h08crmoa welding wire are generally used for DIN 17175 10CrMo910 alloy steel pipe welding.

Dimensions Tolerance

Process performance

The tube should meet the requirements of the ring test. For the expansion rate (diameter change) of the ring-shaped flaring experiment, no impermissible defects (such as cracks, crepe, folding, and delamination) shall occur during the test.

Surface condition

The tube must have a manufacturing method that achieves a relatively smooth inner and outer surface, so that it is possible to use either a hot rolling method or a cold rolling method. Tubes should not have unacceptable cracks, creases and folds. As long as the wall thickness of the steel pipe does not exceed the allowable dimensional deviation, and does not affect the performance of the steel pipe, it is permissible to create some uneven and shallow longitudinal scratches during the manufacturing process. Mechanical machining (such as buffing) can be used to remove the slight subsidence of the surface, but not to reduce the minimum allowable wall thickness.

Heat treatment and processing

Reference data for heat treatment temperature
Hot working is possible from 1100 to 80 ° °C, and the temperature can be reduced to 750 °C during processing.
In the matching-correction work of the local department, attention should be paid to the effective specification of hot work; there should be a supervisory temperature system. In the higher temperature range, ie 1100 to 900 °C, it is suitable for forging and pier thickening, about 85 °C, and the temperature can be lowered to above 75 °C during the processing.
For example, before the last process, or during the same hot working process, if the heating temperature of the workpiece is above the normalizing temperature but not more than 1000 ° C, and the deformation process is above 75 ° C, or ———— In the last process, the degree of deformation does not exceed 5% – at the end of 7 00 °C, then the normalizing of the St35.8, St45.8, 17Mn4, 19Mn5, and 15Mo3 steels is superfluous. The 13CrMo44 and 10CrMo910 only need to be tempered.
For multiple times and/or long time heat treatments at temperatures around 1000 to 1000 °C, the workpiece should be cooled to around 350 °C before the last deformation process. If the normalizing or quenching and tempering treatment is more than enough, then the temperature at which the steel is hot-worked should not exceed 1 000 °C.
Conversely, if the molding end temperature is above 10 °C, then the St35.8, St45.8, 17Mn4, 19Mn5, and 15Mo3 steels must be normalized, while the 13CrMo44 and 10CrMo910 should be tempered.

14MoV63 and X20CrMoV121 steels should be reconditioned after hot work.

Pipes made of steel according to this standard may be cold-worked, such as pipe bending, flaring, drawing and pipe cutting; for X20CrMoV121 and 14CrV63 steels, the high yield point and tensile strength shall be noted. After bending, expanding, and cold drawing with normal deformation, there is no need to supplement the heat treatment.