SUZHOU FRANK STEEL CO.,LTD.
We specialize in seamless steel tube business
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DIN2391 ST45 High Precision Seamless Steel Pipe, No Oxide Layer On The Surface
1. Description
DIN2391 ST45 precision seamless steel pipe is characterized by high precision density and high finish. The precision steel pipe has passed the three advanced heat treatment processes of cold drawing, pickling and cold rolling. There is no oxide layer on the inner and outer walls. The accuracy of the inner and outer walls is very high. The mechanical properties are suitable for bending at any angle and can withstand high pressure. The carbon and manganese content in the precision steel pipe of this grade is moderate, and the hardness, tensile strength and yield strength can meet various processing and use needs. Features of DIN2391 ST45 precision seamless steel pipe: no deformation in cold bending, no crack in expanding, no crack in flattening. It is used in non petroleum, chemical industry, chemical fiber, mechanical equipment, medicine and food.
Size: 6mm-168mm.
W.T.: 0.8mm-12mm.
Shape: Round.
Production type: Cold drawn or cold rolled.
Length: Single random length/ Double random length or as customer’s actual request max length is 10m.
Grade: St30 Si, St30 Al, St35, St45, St52.
2. Surface Quality
There are generally three delivery states.
A. NBK state (no oxidation bright heat treatment) Features--- high precision, good finish, no oxide layer.
B. Black phosphating state Features--- bright in black, good color, strong rust resistance.
C. Galvanizing State Features--- meet special requirements
3. Chemical Composition
| Steel name | C max | Si max | Mn | P max | S max |
| St 30 Si | 0.1 | 0.3 | ≤0.55 | 0.025 | 0.025 |
| St 30 Al | 0.1 | 0.05 | ≤0.55 | 0.025 | 0.025 |
| St 35 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 45 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 52 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 |
4. Mechanical Properties
| Steel Grade | Minimum values for the delivery condition | ||||||||||||
| Steel Name | Steel Number | BK | BKW | BKS | GBK | NBK | |||||||
| Rm | A % | Rm | A % | Rm | ReH | A % | Rm | A % | Rm | ReH | A % | ||
| Mpa | Mpa | Mpa | Mpa | Mpa | Mpa | Mpa | |||||||
| St 30 Si | 1.0211 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 420 | 215 | 30 |
| St 30 Al | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 420 | 215 | 30 |
| St 35 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 315 | 14 | 315 | 25 | 340 to 470 | 235 | 25 |
| St 45 | 1.0408 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440 to 570 | 255 | 21 |
| St 52 | 1.058 | 640 | 4 | 580 | 7 | 580 | 420 | 10 | 490 | 22 | 490 to 630 | 355 | 22 |
5. Details picture
About us
We are manufactory of seamless steel tubes. All tubes are made to order. Please show us what kind of steel grade ( standard ) you want, as long as tube’s OD, wall-thickness, length and quantity, we will give you a quotation immediately.