Precision seamless

Precision seamless

Product description:

Precision seamless tube is a cold rolling process produced by a high-precision, high-quality finish of the steel material. Because of the characteristics of high accuracy, precision machinery, auto parts, hydraulic cylinders, construction (steel sleeve) and other industries It has a very wide range of applications.
Commonly used material
Precision seamless tube commonly used material for 20, # 45 is a lot of material to produce steel as long as not too hard, can be produced according to basic needs such as:.. 10 #; 35 #; 16Mn; 40Cr
chemical composition
Common 20, # 45 precision seamless chemical composition as follows: Chemical composition%

C Si Mn S P Cr
10 0.07-0.13 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035

20 0.17-0.23 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035

35 0.32-0.39 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035

45 0.42-0.50 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035

40Cr 0.37-0.44 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035 0.08-1.10
Production Process
Usually cold rolled precision seamless technology for production process is as follows: round → perforation → pickling → cold rolling → saw head → → pickling → cold-rolled seamless bundling saw head → → bundling
Edit this paragraph Features and Benefits
Precision seamless tube features 1. high precision machining saves wear and tear when the user quantity. 2. Specifications and more wide range of applications. 3. High precision cold-finished, good surface quality, good linearity. 4. Pipe hexagonal inner diameter can be made. 5. steel pipe superior performance, relatively dense metal. seamless steel bar, etc. compared to solid steel, the same torsional strength in bending, lighter, is an economic cross-section steel, Widely used in the manufacture of structural parts and mechanical parts. Precision seamless steel pipe advantage in inheritance, but also has some of its own characteristics. Precision manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving materials and processing time , such as bearing rings, jack sets, has been widely used to manufacture precision steel Precision seamless steel popularization and application of savings, improve processing efficiency, reduce processing steps or equipment investment is important, it can save costs and processing time improve production and material utilization, and help to improve product quality, reduce costs, improve economic efficiency are important. generally require a higher accuracy using precision seamless tube industry, mostly with no precision requirements None seam pipe, after all, the same specifications than the price of seamless precision seamless high.
Delivery Status
Delivery Status Code Description
Cold / hard BK last no heat treatment after cold working, which can only be a very small tube deformation
Cold / soft BKW After final heat small amount of cold deformation, machining of the pipe ends
It allows a limited cold deformation (eg: bending, flaring)
Cold stress relief annealing after the final cold BKS annealed at Ac 1 or less, in order to eliminate cold stress
After annealing GBK last cold, fully annealed steel in a protective atmosphere carried out under
After normalizing NBK last cold, steel normalizing conducted under protective atmosphere
Edit this paragraph mechanical properties
Precision seamless mechanical properties Standard Grade General Delivery status

Cold / hard (BK) cold / soft BKW

tensile strength
σb (MPa) rear extension
Long rates
δ5 (%) Tensile strength
σb (MPa) bring up the rear
Elongation δ5 (%)

GB / T3639-2000 10 # ≥410 ≥6 ≥375 ≥10
GB / 3077-1988 20 # ≥510 ≥5 ≥450 ≥8

35# ≥590 ≥4 ≥550 ≥6

45# ≥645 ≥4 ≥630 ≥5

40cr ≥784 ≥12

37Mn5 ≥784 ≥12

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