Cold Drawn Stainless Steel Honed Cylinder Tubing
General Information
- Place of Origin: China (Jiangsu Myler Hydro Co., Ltd)
- Brand: Myler
- Certification: ISO9001:2008
Order & Shipping Terms
- Minimum Order Quantity: 1 Ton
- Price: Negotiable
- Delivery Time: ~30 Days
- Payment Terms: L/C or T/T
- Supply Ability: 30 Tons per day
- Packaging: Anti-rust oil, paper wrapping, plastic caps on both ends
Materials & Standards
- Base Materials: Cold drawn stainless or carbon steel
- Standards: GB/T, DIN2391, EN10305-1
- Delivery Conditions: BK (cold drawn, hard) BK+SR (cold drawn + stress-relieved) NBK (normalized)
- Inner Bore Tolerance: H8
- Surface Roughness: Ra 0.2–0.4 μm
Chemical Composition (Examples)
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Other Elements |
| 20# | 0.17–0.23 | 0.17–0.37 | 0.35–0.65 | ≤0.035 | ≤0.035 | Cu, Ni, Cr, etc. |
| 45# | 0.42–0.50 | same | 0.50–0.80 | ≤0.025 | ≤0.020 | Cu, Ni, Cr, etc. |
| Others | 25Mn, 27SiMn, Q345B/ST52 | include V, Nb, Ti, Al |
Chemical Composition
| Steel Grade | 20# | 45# | 25Mn | 27SiMn | Q345B(ST52) | *Q345D(ST52) |
| C | 0.17-0.23 | 0.42-0.50 | 0.22-0.29 | 0.24-0.32 | 0.2 | 0.18 |
| Si | 0.17-0.37 | 0.17-0.37 | 0.17-0.37 | 1.10-1.40 | 0.55 | 0.55 |
| Mn | 0.35-0.65 | 0.50-0.80 | 0.70-1.00 | 1.10-1.40 | 1.00-1.60 | 1.00-1.60 |
| P | 0.035 | 0.025 | 0.03 | 0.035 | 0.04 | 0.03 |
| S | 0.035 | 0.02 | 0.03 | 0.035 | 0.04 | 0.03 |
| Cu | 0.25 | 0.2 | 0.2 | 0.3 | / | / |
| Ni | 0.3 | 0.25 | 0.25 | 0.3 | / | / |
| Cr | 0.25 | 0.25 | 0.25 | 0.3 | / | / |
| V | / | / | / | / | 0.02-0.15 | 0.02-0.15 |
| Nb | / | / | / | / | 0.015-0.06 | 0.015-0.06 |
| Ti | / | / | / | / | 0.02-0.20 | 0.02-0.20 |
| Al | / | / | / | / | / | 0.015 |
Mechanical property
| Supply Condition | Cold finished(Hard) – BK | Cold Drawn & Stress – relieved (BK+S) | Hardness | |||
| Steel Grade | Tensile Strength | Elongation(%) | Tensile Strength | Yield Strength | Elongation(%) | HB |
| Mpa | Mpa | Mpa | ||||
| 20# | ≧620 | ≧8 | ≧570 | ≧470 | ≧14 | 175 |
| 45# | ≧650 | ≧5 | ≧600 | ≧520 | ≧12 | 207 |
| ST52 | ≧640 | ≧5 | ≧600 | ≧520 | ≧15 | 190 |
| 25Mn | ≧640 | ≧5 | ≧600 | ≧510 | ≧15 | 195 |
| 27SiMn | ≧840 | ≧5 | ≧800 | ≧720 | ≧10 | 230 |
Delivery Conditions for Hydraulic Cylinder Tube
| # | Item | Details |
| 1 | Specification | GB/T3639, DIN2391, EN10305-1 |
| 2 | Delivery Status | Stress Relieve |
| 3 | OD Tolerance | OD ≤ 40 mm: ±0.2 mm |
| 40–100 mm: ±0.3 mm | ||
| >100 mm: ±0.5 mm | ||
| 4 | WT Tolerance | OD ≤ 100 mm: ±5% |
| OD > 100 mm: ±7.5% | ||
| 5 | Straightness | ≤ 0.5 mm / 1000 mm |
| 6 | ID Tolerance | ISO H8 |
| 7 | ID Roughness | Ra 0.2–0.4 μm |
| 8 | Length | 5.0–5.8 m |
| 9 | Tolerance for Fixed Length | ≤500 mm: +3 mm |
| 500–2000 mm: +5 mm | ||
| 2000–5000 mm: +10 mm | ||
| 5000–7000 mm: +20 mm | ||
| 10 | Stenciling | Mill name + specification + delivery status + steel grade + size + heat number |
| 11 | Anti-Rust | High-quality anti-rust oil applied inside; protects for up to 6 months |
| 12 | Tube Ends | Plain ends with plastic caps on both ends |
| 13 | Packing | Hexagonal packing with plastic sheets inside and woven cloth outside |
Standard Sizes for Honed Tubes
| No. | OD (mm) | ID (mm) | WT (mm) | Weight (kg/m) | Length (m) |
| 1 | 40 | 30 | 5 | 4.32 | 3.0–4.0 |
| 2 | 40 | 32 | 4 | 3.55 | 3.0–4.0 |
| 3 | 42 | 35 | 3.5 | 3.32 | 3.0–4.0 |
| 4 | 45 | 35 | 5 | 4.58 | 3.0–4.0 |
| 5 | 50 | 40 | 5 | 5.48 | 5.0–5.8 |
| 6 | 55 | 45 | 5 | 6.17 | 5.0–5.8 |
| 7 | 60 | 50 | 5 | 6.85 | 5.0–5.8 |
| 8 | 63.5 | 50 | 6.75 | 9.06 | 5.0–5.8 |
| 9 | 63.5 | 53 | 5.25 | 7.05 | 5.0–5.8 |
| 10 | 65 | 50.8 | 7.1 | 9.95 | 5.0–5.8 |
| 11 | 65 | 58 | 3.5 | 5.01 | 5.0–5.8 |
| 12 | 70 | 60 | 5 | 8.01 | 5.0–5.8 |
| 13 | 70 | 63 | 3.5 | 5.6 | 5.0–5.8 |
| 14 | 73 | 63 | 5 | 8.38 | 5.0–5.8 |
| 15 | 75 | 63 | 6 | 9.56 | 5.0–5.8 |
| 16 | 80 | 65 | 7.5 | 12.26 | 5.0–5.8 |
| 17 | 90 | 80 | 5 | 10.48 | 5.0–5.8 |
| 18 | 90 | 80 | 5 | 10.48 | 5.0–5.8 |
| 19 | 90 | 80 | 5 | 10.48 | 5.0–5.8 |
| 20 | 90 | 75 | 7.5 | 13.87 | 5.0–5.8 |
| 21 | 95 | 80 | 7.5 | 16.17 | 5.0–5.8 |
| 22 | 100 | 85 | 7.5 | 17.78 | 5.0–5.8 |
| 23 | 105 | 90 | 7.5 | 18.91 | 5.0–5.8 |
| 24 | 72.6 | 63.5 | 4.55 | 7.3 | 5.0–5.8 |
| 25 | 75 | 65 | 5 | 8.03 | 5.0–5.8 |
| 26 | 80 | 70 | 5 | 8.95 | 5.0–5.8 |
| 27 | 85 | 75 | 5 | 9.25 | 5.0–5.8 |
| 28 | 85 | 70 | 7.5 | 13.44 | 5.0–5.8 |
| 29 | 90 | 75 | 7.5 | 14.13 | 5.0–5.8 |
| 30 | 90 | 80 | 5 | 10.48 | 5.0–5.8 |
| 31 | 90 | 80 | 5 | 10.48 | 5.0–5.8 |
| 32 | 90 | 80 | 5 | 10.48 | 5.0–5.8 |
| 33 | 94 | 75 | 9.5 | 16.15 | 5.0–5.8 |
| 34 | 101.6 | 88.9 | 6.35 | 14.92 | 5.0–5.8 |
Chemical Composition (%)
| Element | 20# | 45# | 25Mn | 27SiMn | Q345B (ST52) | Q345D (ST52) |
| C | 0.17–0.23 | 0.42–0.50 | 0.22–0.29 | 0.24–0.32 | ≤0.20 | ≤0.18 |
| Si | 0.17–0.37 | 0.17–0.37 | 0.17–0.37 | 0.50–0.80 | ≤0.55 | ≤0.50 |
| Mn | 0.35–0.65 | 0.50–0.80 | 1.00–1.40 | 1.10–1.40 | 1.00–1.60 | 1.00–1.60 |
| P | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.030 |
| S | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.030 |
| Cu | ≤0.20 | ≤0.20 | / | / | ≤0.30 | ≤0.30 |
| Ni | ≤0.30 | ≤0.30 | / | / | ≤0.30 | ≤0.30 |
| Cr | ≤0.25 | ≤0.25 | / | ≤0.30 | ≤0.30 | ≤0.30 |
| Al | / | / | / | / | ≥0.015 | ≥0.015 |
| Nb | / | / | / | / | 0.02–0.015 | 0.02–0.015 |
| Ti | / | / | / | / | 0.02–0.20 | 0.02–0.20 |
Note: Q345D guarantees impact value ≥ 27J at -20°C.
Mechanical Properties
| Steel Grade | Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| 20# | Cold Finished (BK) | ≥620 | — | ≥8 |
| Stress-relieved (BK+S) | ≥570 | ≥470 | ≥14 | |
| 45# | BK | ≥650 | — | ≥5 |
| BK+S | ≥600 | ≥530 | ≥10 | |
| ST52 | BK | ≥640 | — | ≥5 |
| BK+S | ≥600 | ≥520 | ≥15 | |
| 25Mn | BK | ≥640 | — | ≥5 |
| BK+S | ≥600 | ≥520 | ≥10 | |
| 27SiMn | BK | ≥840 | — | ≥5 |
| BK+S | ≥720 | ≥600 | ≥10 |
Mechanical Properties
Typical for 20# steel
- Tensile Strength: ≥620 MPa
- Elongation: ≥8%
- BK condition: ≥570 MPa tensile, ≥470 MPa yield, ≥14% elongation, 175HB
Typical for 45# steel
- Tensile Strength: ≥650 MPa
- Elongation: ≥5%
- BK condition: ≥600 MPa tensile, ≥520 MPa yield, ≥12% elongation, 190HB
ST52, 25Mn, 27SiMn: Also available with detailed mechanical specs.
Dimensional Tolerances
Outer Diameter (OD)
- <40 mm: ±0.2 mm
- 40–100 mm: ±0.3 mm
- 100 mm: ±0.5 mm
Wall Thickness Tolerance
- OD <100 mm: ±5%
- OD >100 mm: ±7.5%
Straightness
- ≤0.5 mm per 1000 mm
Length & Tolerance
- Normal: 5.0–5.8 m
- ≤500 mm: +3 mm
- 500–2000 mm: +5 mm
- 2000–5000 mm: +10 mm
- 5000–7000 mm: +20 mm
Key Features
- High dimensional accuracy through cold drawing
- Mirror-smooth inner bore from honing or polishing
- Material saving by reducing wall thickness (~30%)
- Stress-relieving annealing enhances dimensional stability
- Surface roughness ideal for hydraulic and pneumatic use
Applications
- Hydraulic and pneumatic cylinder tubes
- Industrial equipment
- Precision mechanical components
Get In Touch
Contact Info
- Changzhou City, Jiangnan Province, China
- info@chromerods.com
- +86-18261507005
