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Honing seamless steel pipes produced by undergo cold forcing and annealing for a cured tensile strength reaching over 52kg/cm2,before the pipes are milled by precision machinery,regulating the tolerance in inner diameter at an H8-H9 level,with surface roughness at between Ra 0.2μm-Ra 0.8μm,which helps to extend the life cycle of the cylinder,and reduces the wear and tear of the seal.The maximum inner diameter of the cylinders produced by our factory reaches 1000mm,with maximum buffing reaching ID length 13000mm.
Products Description
Product Name | ||||
Standard | DIN2391, EN10305, ASTM A519, GB/T 3639-200 | |||
Material | Q355B Q355D C20,ST52,E355 SAE1026.CK45 4130 4140 STKM 13C | |||
Heat treatment | BK+S | |||
Specification | Outer diameter(mm) : 40-480mm | |||
I.D Tolerance | H8-H9 | |||
Length | Fixed Length, Random Length(3--9m)or as requests of customers | |||
Straightness | 0.5-1/1000 | |||
ID roughness | RA 0.1-0.8micron(max) | |||
Payment term | FOB, CFR, CIF ,EXW, FCA and so on | |||
MOQ | 3 tons | |||
Technology | Honed & SRB(SKIVED AND ROLLER BURNISHED ) | |||
Application: | hydraulic cylinder, swivel crane, injection machine and so on | |||
Conservation | anti rust oiled inside and outside surface, plastic caps in both ends | |||
Package | bundle with steel strip and knitting strip, or wooden case |
Steel Grade | C | SI | Mn | P | S | Cr | Ni | Cu |
20# | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.250 | 0.250 | |
45# | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.250 | 0.250 | |
Q345B | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 | 0.030 | 0.250 | 0.08 |
Q345D | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 | 0.250 | 0.250 | 0.15 |
25Mn | 0.22-0.29 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 | |||
27SiMn | 0.22-0.32 | 1.10-1.40 | 1.10-1.40 | 0.035 | 0.035 | 0.300 | 0.300 | |
E355 | ≤0.2 | ≤0.55 | ≤1.6 | 0.025 | 0.025 | |||
SAE1026 | 0.22-0.28 | 0.15-0.35 | 0.60-0.90 | 0.040 | 0.050 |
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