Steel Tube Handbook - 2018

88 Tubes for bearing production Dimensions of precision tubes for manufacturing of bearing: Table 37 Outside diameter [mm] Wall thickness [mm] 22–25 3–4,1 25,01–29 3–5 29,01–32 3–6,7 32,01–40 3–7,8 40,01–70 3–8 Tolerances outside diameter D < 50 mm: 0 + 0,15 mm D ≥ 50 mm: 0 + 0,25 mm wall thickness ± 7,5 % (upon agreement ± 5 %) Lengths 3 000 ±500 mm Straightness 1 mm/1000 mm, max 2,5 mm/3000 mm Steel grade DIN 17 230 – 100Cr6 (or 14 109 according STN, ČSN). C Mn Si P S Cr Ni Cu Sn 0,90 1,10 0,30 0,50 0,15 0,30 max 0,017 max 0,015 1,30 1,65 max 0,10 max 0,15 max 0,010 Delivery condition (heat treatment) GKZ + K + G – annealed for globular carbide + cold finished + soft annealed. Hardness After soft annealing is 174 – 220 HB. Dispersion of hardness along the tube length max 15 HB. Hardness by quenching test is min 61 HRc. Surface condition The tubes are delivered with surface after soft annealing. Max depth of defects is 0,25 mm inclusive decarbonizing. Microstructure Tested according to SEP 1520: • size of carbide 2.1 – 2.3 • lamellar pearlite 3.0 • carbide net 5.2 • carbide line spacing max 6.3 – continuous max 7.3 – released Micropurity Tested according to DIN 50602. Total value (oxide + sulphide) K3 ≤ 10. Demagnetizing Residual magnetism max 10 Oe. Tube ends Plain square cut ends, one end bevelled 0,5–4 mm x 45°. Testing Testing according to DIN 17 230. NDT upon agreement ac- cording to EN 10246-3 E2H and EN 10246-7 U2/B and test of material identification of alloy steel. Marking Bundles are marked with label. Surface protection Oiled. Packaging Tubes are packed in bundles of weight of 1 000–3 000 kg. Certified test report According to DIN 50049 - EN 10204 - 3.1.B. (3.1). Notes: 1. Possible to deliver also in condition Hot finished. 2. Deliveries according standard EN ISO 683-17 too: • Dimensions and tolerances upon agreement. • Surface condition and designation: Hot formed – without or HW Cold drawn – CD • Heat treatment and delivery condition: Without heat treatment – without or +U Heat treatment for sferoidization and cold drawn +AC+C Heat treatment for sferoidization +AC

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