Dimensions:
- Outer Diameter (O.D): 20 mm – 520 mm
- Inner Diameter (I.D): 12 mm – 510 mm
Tolerances and Specifications:
- I.D Tolerance (mm): H7 – H10
- Roughness (I.D): ≤ 0.3 μm
- Straightness: 0 – 0.60 mm/meter
- Minimum Order Quantity (MOQ): 1.0 – 3.0 tons
Inspection and Quality Control:
- Inspection Types: Chemical analysis, Mechanical analysis, Roughness, Straightness, Surface quality, and Dimension report
- Third-party Inspection: Acceptable
Origin:
- Place of Origin: Jiangsu/Hubei, China
Applications of 4140 Alloy Steel Honed Tube
The 4140 / 42CrMo4 / 1.7225 / SCM440TK alloy steel honed tube is widely utilized in various applications, including:
- Hydraulic cylinders
- Hydraulic jacks
- Hydraulic oil cylinders
- Pneumatic cylinders
- Swivel cranes
- Injection machines
- Petrifaction oil pumps
- Coal mining machinery
- Engineering machinery
- Crane and transport machinery
- Auto transmission axes
- Plastic machinery
- Absorbers
- Spin printing and dyeing
Quality Standards
Our honed tubes conform to the following quality standards:
- DIN 2391: Seamless Precision Steel Tubes
- EN 10305: Steel Tubes for Precision Applications (Seamless Cold Drawn Tubes)
Comparison of All Grades
| ASTM |
EN |
JIS |
GB |
| 4140 |
42CrMo4/1.7225 |
SCM440TK |
42CrMo |
Chemical Composition (%)
| Steel Grade |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
| 4140 |
0.38-0.43 |
0.15-0.35 |
0.75-1.00 |
0.040 max |
0.040 max |
0.80-1.10 |
0.15-0.25 |
| 42CrMo4 |
0.38-0.45 |
0.40 max |
0.60-0.90 |
0.025 max |
0.035 max |
0.90-1.20 |
0.15-0.30 |
| SCM440TK |
0.38-0.43 |
0.15-0.35 |
0.60-0.90 |
0.030 max |
0.030 max |
0.90-1.20 |
0.15-0.30 |
| 42CrMo |
0.38-0.45 |
0.17-0.37 |
0.50-0.80 |
0.030 max |
0.030 max |
0.90-1.20 |
0.15-0.25 |
Tolerances for Inner Diameter (mm)
| Inner Diameter Range (mm) |
H7 |
H8 |
H9 |
H10 |
| 10 < ID ≤ 18 |
-0, +0.018 |
-0, +0.027 |
-0, +0.043 |
-0, +0.070 |
| 18 < ID ≤ 30 |
-0, +0.021 |
-0, +0.033 |
-0, +0.052 |
-0, +0.084 |
| 30 < ID ≤ 50 |
-0, +0.025 |
-0, +0.039 |
-0, +0.062 |
-0, +0.100 |
| 50 < ID ≤ 80 |
-0, +0.030 |
-0, +0.046 |
-0, +0.074 |
-0, +0.120 |
| 80 < ID ≤ 120 |
-0, +0.035 |
-0, +0.054 |
-0, +0.087 |
-0, +0.140 |
| 120 < ID ≤ 180 |
-0, +0.040 |
-0, +0.063 |
-0, +0.100 |
-0, +0.160 |
| 180 < ID ≤ 250 |
-0, +0.046 |
-0, +0.072 |
-0, +0.115 |
-0, +0.185 |
| 250 < ID ≤ 315 |
-0, +0.052 |
-0, +0.081 |
-0, +0.130 |
-0, +0.210 |
| 315 < ID ≤ 400 |
-0, +0.057 |
-0, +0.089 |
-0, +0.140 |
-0, +0.230 |
| 400 < ID ≤ 500 |
-0, +0.063 |
-0, +0.097 |
-0, +0.155 |
-0, +0.250 |
Mechanical Properties (T = 20°C if not otherwise stated)
| Condition |
Tensile Strength Rm (MPa) |
Yield Strength R2 (MPa) |
Elongation in 2 in or 50 mm A (%) |
| +BKS |
830 min |
660 min |
10 min |
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