Dactron Pipe
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At these stages, accuracy is crucial to ensure that each component meets the precise specifications required to achieve optimal performance.
| Serial Number | Inspection Items | Sampling Quantity |
|---|---|---|
| 1 | chemical composition | Take one sample from each furnace number |
| 2 | tensile strength | Take one sample from each batch of two steel pipes |
| 3 | hardness | Take one sample from each batch of two steel pipes |
| 4 | Non metallic inclusions | Take one sample from each batch of two steel pipes |
| 5 | flatten | Take one sample from each batch of two steel pipes |
| 6 | flaring | Take one sample from each batch of two steel pipes |
| 7 | eddy current testing | Test one by one |
| 8 | Internal and external surface roughness | Take one sample from each batch of two steel pipes |
| GRADE | C | Si | Mn | Cr | Ni | Mo | P | S |
|---|---|---|---|---|---|---|---|---|
| 20# | 0.17~0.23 | 0.17~0.37 | 0.35~0.65 | ≤0.25 | ≤0.30 | ---- | ≤0.035 | ≤0.035 |
| 45# | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | ≤0.25 | ≤0.30 | ---- | ≤0.035 | ≤0.035 |
| 40Cr | 0.37~0.44 | 0.17~0.37 | 0.50~0.80 | 0.80~1.10 | ≤0.30 | ≤0.1 | ≤0.030 | ≤0.030 |
| GB | ASTM | BS | JIS | NF | DIN |
|---|---|---|---|---|---|
| 20 | 1020 | 050A20 | S20C | XC18 | C22,CK22 |
| 45 | 1045 | 080M46 | S45C | XC45 | C45,CK45 |
| 40Cr | 5140 | 41Cr4 | SCR440 | 41Cr4 | 41Cr4 |
| Processing |
Cold rolled/ Cold drawn 1. BK (+C) No heat treatment after last cold forming process. 2. BKW (+LC) Light finishing pass (cold drawing) 3. BKS (+SR) Stress relieve annealed. 4. GBK (+A) Annealed in a controlled atmosphere. 5. NBK (+N) Annealed above upper transformation point. |
|---|---|
| Packing | Woven bag/ Wooden or crate carton/ Bundle Packing/ Plain end or vanished as per customer's request. |
| Delivery time | Normally 30-40 working days |
