-
A106GR.B A53B A315B A178C SA210A fluid seamless steel pipe manufacturer
Fluid pipe is a kind of steel pipe with hollow section and no weld from beginning to end. Steel pipe has hollow section, which is widely used as a pipe for conveying fluid, oil, natural gas, gas, water and some solid materials.
-
S45C 1045 XC45 C60 seamless steel pipe factory direct sales
S45C is a medium carbon structural steel with good cold and hot workability, good mechanical properties, low price and wide sources, so it is widely used. Its biggest weakness is its low hardenability, large cross-sectional dimensions and high-demand workpieces.
The quenching temperature of S45C steel is A3+(30~50) ℃. In actual operation, the upper limit is generally taken. A higher quenching temperature can speed up the heating of the workpiece, reduce surface oxidation, and improve work efficiency. In order to homogenize the austenite of the workpiece, sufficient holding time is required. If the actual amount of furnace installed is large, the holding time needs to be extended appropriately. Otherwise, there may be insufficient hardness due to uneven heating. However, if the holding time is too long, coarse grains and serious oxidative decarburization will also occur, which will affect the quenching quality. We believe that if the installed furnace volume is greater than the provisions of the process documents, the heating and holding time needs to be extended by 1/5.
Because of the low hardenability of No. 45 steel, a 10% saline solution with a high cooling rate should be used. After the workpiece enters the water, it should be quenched, but not cold through. If the workpiece is cooled in salt water, it may crack the workpiece. This is caused by the rapid transformation of austenite into martensite when the workpiece is cooled to about 180°C. Caused by excessive tissue stress. Therefore, when the quenched workpiece is rapidly cooled to this temperature region, a slow cooling method should be adopted. Since the temperature of the outlet water is difficult to control, it must be operated based on experience. When the shaking of the workpiece in the water stops, the outlet can be air-cooled (oil cooling is better). In addition, the workpiece should be moved but not static when entering water, and should be moved regularly according to the geometric shape of the workpiece. The static cooling medium and the static workpiece result in uneven hardness, uneven stress and large deformation or even cracking of the workpiece.
The hardness of S45C steel quenched and tempered parts after quenching should reach HRC56~59. The possibility of large cross-section is lower, but it cannot be lower than HRC48. Otherwise, it means that the workpiece has not been completely quenched, and sorbite or even ferrite may appear in the structure. Organization, this kind of organization is still retained in the matrix through tempering, failing to achieve the purpose of quenching and tempering.
For high temperature tempering of S45C steel after quenching, the heating temperature is usually 560~600℃, and the hardness requirement is HRC22~34. Because the purpose of quenching and tempering is to obtain comprehensive mechanical properties, the hardness range is relatively wide. However, if the drawings have hardness requirements, the tempering temperature must be adjusted according to the drawings to ensure the hardness. For example, some shaft parts require high strength, so the hardness requirements are high; and some gears and shaft parts with keyways need to be milled and inserted after quenching and tempering, so the hardness requirements are lower. Regarding the tempering and holding time, it depends on the hardness requirements and the size of the workpiece. We believe that the hardness after tempering depends on the tempering temperature, and has little to do with the tempering time, but it must be back through. Generally, the tempering and holding time of the workpiece is always More than one hour. -
A large number of steel pipe manufacturers in stock
Seamless pipes for structures (GB / t8162-2008) are seamless pipes for general structures and mechanical structures.
-
SA210C STS49 ST52 high-quality seamless steel pipe manufacturer spot
(1) High quality carbon structural steel grades include 20g, 20mng and 25mng.
(2) Alloy structural steel grades: 15mog, 20mog, 12crmog, 15CrMoG, 12CR2MOG, 12crmovg, 12Cr3MoVSiTiB, etc.
-
Quality and quantity of large diameter fluid steel pipe
The full name of UHPE steel plastic composite pipe is UHMWPE steel plastic composite pipe. UHMWPE Composite pipe is made of UHMWPE pipe and carbon steel pipe through scientific process.
-
SA210C STPL39 STS49 STPT49 ST52 ST35N low temperature steel pipe genuine spot
Q345C seamless steel pipe is compared with Q345A and B. Low temperature impact test has low temperature and good performance. Ratio of P and s containing hazardous materials to Q345A, Differences between Q345A, Q345B and Q345C
-
A333GR.6 ST35N STPL39 G3460 alloy steel pipe
Seamless steel pipe for low temperature pipeline
A333Gr6 cryogenic tube
A333Gr6 cryogenic tube
Spot specifications: 8-1240×1-200mm<1/8”—48”×SCH5S—SCH160, STD, XS, XXS>
Executive standard: GB/T18984-2003, ASTM A333
Product material: 16MnDG cryogenic tube, 10MnDG cryogenic tube, 09DG cryogenic tube, 09Mn2VDG cryogenic tube, 06Ni3MoDG cryogenic tube,
ASTM A333Gr1 cryogenic tube, A333Gr3 cryogenic tube, A333Gr4 cryogenic tube, A333Gr6 cryogenic tube, A333Gr7 cryogenic tube, A333G8 cryogenic tube, A333Gr9 cryogenic tube,
A333Gr10 cryogenic tube, A333Gr11 cryogenic tube
Product application: suitable for -45℃～-195℃ low-temperature pressure vessel pipes and seamless steel pipes for low-temperature heat exchanger pipes
Seamless steel pipe for low temperature pipeline
Product specifications: 8-1240×1-200mm<1/8”—48”×SCH5S—SCH160, STD, XS, XXS>
Product material: 16MnDG, 10MnDG, 09DG, 09Mn2VDG, 06Ni3MoDG,
ASTM A333-Grade1, Grade3, Grade4, Grade6, Grade7, Grade8, Grade9,
Grade10, Grade11 -
S210C A333GR.6 low temperature resistant steel pipe quality assurance
The steel used for low-temperature alloy tubes is compared with carbon structural steel. It has the advantages of high strength, good comprehensive performance, long service life, wide application range, and relatively economical. The steel is mostly rolled into plates, sections, seamless steel pipes, etc., and is widely used in bridges, ships, boilers, vehicles and important building structures.
Seamless steel pipe for low temperature pipeline
Spot specifications: 8-1240×1-200mm<1/8”—48”×SCH5S—SCH160, STD, XS, XXS>
Product material: 10MnDG, 09DG, 09Mn2VDG, 06Ni3MoDG,
ASTM A333-Grade1, Grade3, Grade4, Grade6, Grade7, Grade8, Grade9,
Grade10, Grade11
Product application: suitable for -45℃～-195℃ low-temperature pressure vessel pipes and seamless steel pipes for low-temperature heat exchanger pipes
Production process: cold drawn and hot rolled
Low-temperature alloy pipes generally use low-alloy high-strength structural steel (GB/T1591-1994)
In addition to a certain amount of basic elements of silicon or manganese, this type of steel also contains other elements suitable for my country’s resource situation. Such as vanadium (V), niobium (Nb), titanium (Ti), aluminum (Al), molybdenum (Mo), nitrogen (N), and rare earth (RE) and other trace elements. According to chemical composition and performance requirements, its grades are Q295A, B, Q345A, B, C, D, E, Q390A, B, C, D, E, Q420A, B, C, D, E, Q460C, D, E, etc. Steel grade means the same meaning as carbon structural steel.
V, Nb, Ti, Al and other grain-refining trace elements, in addition to A, B grade steel in this type of steel, the C, D, E grade steel should contain at least one of them; in order to improve the performance of steel , A and B grade steel can also be added to one of them. In addition, the residual element content of Cr, Ni, and Cu of this type of steel is not more than 0.30% each. Q345A, B, C, D, E are the representative grades of this type of steel, among which grades A and B are usually called 16Mn; steels above grade C need to add more than one trace element, and one additional low-temperature impact property is added to its mechanical properties.
Common materials for cryogenic pipes: Q345B, Q345C, Q345D, Q345E, A33Gr6
- Call Support 0086-18365819992
- Email Support sales@weichuanmetal.com
