( Div. of Sterling Tubes & Valves Pvt. Ltd. )

Manufacturing Technique

Cold Drawn - Skived & Roller Burnished, Honed Tubes Boring and turning tubes, machined honed tubes, seamless honed tubes, machined honed pipes, turning and boring honed tubes.

Skiving And Roller Burnishing Is A Two-Part, One-Pass Process That Removes Stock With Skiving Knives, Then Cold-Works Metal Surfaces With Rollers To Achieve The Highest Surface Finish Tolerances. This Process Is Commonly Used To Finish Hydraulic And Pneumatic Cylinders. Another Is Called Honing. Honing Is An Operation That Is Used Primarily To Improve The Surface Finish Of Holes Produced By Processes Such As Boring, Drilling, And Internal Grinding. The Honing Tool Consists Of A Set Of Aluminum Oxide Or Silicon-Carbide Bonded Abrasive Sticks, Usually Called Stones.

Products

Skiving Roller Burnishing / Honed Tubes manufacturing process flow under :-

  • Use of prime quality raw material
  • Well defined process control at each stage of manufacturing
  • Implementation of international quality management standards for continual improvement & upgrading technical capabilities
  • Tubes are cold drawn to provide precise dimensions and smooth surfaces finish.
  • Well heat treated materials gives extra softness in machining and better weld-ability for Hydraulic Cylinders manufacturing process.
  • Well anti rusted oiling inside of tubes and plastic caps /scratch roll packing both the end of tubes for protecting weather effect.

  • Material : Mild / Carbon Steel - ST52, E355, C20,
    ASTM-106 Stainless Steel 304, 316
  • Standard : DIN2391, EN10305
  • Delivery Condition : BK, BK+S, GBK, NBK
  • ID Size : 32mm – 1200mm
  • Straightness : ≤ 0.5/1000
  • Roughness : 0.2-0.4 um
  • Standard Length : 4000mm To 5800mm And As Per Customer Requirements

Application

hydraulic cylinder, pneumatic cylinder,Jack, cylinder barrel,and and all pipes have requirement for tolerance.Finishing of cylinders for internal combustion engines, air bearing spindles and gears, used in oil, telecom, power plants, general engineering purposes, electrical industries and for various hydraulic applications like Hydraulic Cylinder, Hydraulic Jack, hydraulic oil cylinder pneumatic cylinder, petrifaction oil pump, coal mine, engineering machinery, crane and transport machinery, auto transmission axes, plastic machinery, engineering machinery, crane and transport machinery, auto transmission axes, plastic machinery, hydraulic oil cylinder, pneumatic cylinder, absorber, spin printing and dyeing, forklift, pump barrels, etc.

Part Of Size List (ID*OD)

  • 40*50
  • 40*55
  • 50*60
  • 50*63
  • 60*70
  • 60*73
  • 63*73
  • 63*76
  • 70*80
  • 70*82
  • 70*85
  • 80*90
  • 80*92
  • 80*95
  • 80*100
  • 90*102
  • 90*105
  • 100*114
  • 100*121
  • 100*127
  • 110*130
  • 120*140
  • 120*145
  • 125*140
  • 125*145
  • 140*165
  • 140*168
  • 150*180
  • 160*184
  • 160*194
  • 170*200
  • 180*210
  • 200*216
  • 200*220
  • 200*232
  • 200*245
  • 220*250
  • 220*273
  • 240*273
  • 250*266
  • 250*280
  • 250*300
  • 280*323
  • 280*325
  • 300*320
  • 300*356
  • 320*340
  • 320*356
  • 320*370
  • 350*370
  • 400*420

Heat /Treating Method/Delivery Condition:

BK BKS GBK NBK Q+T
+C +SR +A +N Q+T
Cold drawn Stress relieved Annealed Normalized QUENCHED + TEMPERED

Parameters :

Manufacture method Cylinder ID(mm) Length(m) Straightness(mm/m) Toleranceon ID Roughness(μm)
Cold drawn 40-420 ≤16M 0.2-0.5 Depends on requirement 0.8-1.6
cold drawn - honed 40-420 12M 0.2-0.3 H8-H9 0.2-0.8
Cold drawn - skived & burnished 40-420 9M 0.2-0.3 H8-H9 ≤0.4

Mechanical Property :

Final Supply Condition Cold finished(Hard)(BK) Cold drawn and stress-relieved (BK+S or + SR) Hardness HB
Parameters T.SobN/mm2 Elongation δ5% T.S obN/mm2 Y.S OsN/mm2 Elongation δ5%
20# (A106B, ST45, E255) ≧550 ≧8 ≧520 ≧375 ≧12 175
45#(CK45) ≧650 ≧5 ≧600 ≧500 ≧10 190
Q345B(ST52, E355) ≧640 ≧5 ≧600 ≧520 ≧15 190
25Mn ≧640 ≧5 ≧600 ≧510 ≧15 195
27SiMn ≧840 ≧5 ≧760 ≧610 ≧10 220

Chemical Properties :

Material C% Mn% Si% S% P%
20# 0.17-0.23 0.35-0.65 0.17-0.37 ≤0.035 ≤0.035
ST45 ≤0.21 ≥0.4 ≤0.35 ≤0.025 ≤0.025
E255 ≤0.21 0.4-1.1 ≤0.35 ≤0.025 ≤0.025
45# 0.42-0.50 0.50-0.80 0.17-0.37 ≤0.035 ≤0.035
Q345B ≤0.20 ≤1.70 ≤0.50 ≤0.035 ≤0.035
E355 ≤0.22 ≤1.6 ≤0.55 ≤0.025 ≤0.025
ST52 ≤0.22 ≤1.6 ≤0.55 ≤0.04 ≤0.04
25Mn 0.22-0.29 0.70-1.0 0.17-0.37 ≤0.035 ≤0.035
27SiMn 0.24-0.32 1.10-1.40 1.10-1.40 ≤0.035 ≤0.035

Tolerance On ID :

ID Tolerance for ID  (μm)
H7 H8 H9 H10
30 +210 +330 +520 +840
>30-50 +250 +390 +620 +1000
>50-80 +300 +460 +740 +1200
>80-120 + 350 + 540 +870 +1400
>120-180 +400 +630 +1000 +1600
>180-250 +460 +720 +1150 +1850
>250-315 +520 +810 +1400 +2100
>315-400 +570 +890 +1700 +2300

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