Changzhou Joyruns Steel Tube CO.,LTD
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EN 10305-1 E355+BK Seamless cold-drawn or cold-rolled steel tubes for precision applications
Seamless Precision Steel Tubing, bright heat treatment without oxidation (NBK status), non-destructive testing, cleaning, phosphating, anti-rust oil dipping, the application for machine tools industry, construction machinery, shipbuilding industry-hydraulic system, automotive steel tube, and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required.
It is used in hydraulic systems, automobile and precision machinery parts for cars and cylinders.
Delivery status: BK(+C), BKS(+SR), BKW(+LC), GBK(+A), NBK(+N)
| Chemical composition (cast analysis)a | |||||||
| Steel name | Steel number | C | Si | Mn | P | S b | Al |
| max. | max. | max. | max. | max. | min. | ||
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.03 | 0.03 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.03 | 0.03 | – |
| E355 c | 1.0580 | 0.22 | 0.55 | 1.60 | 0.03 | 0.03 | – |
Mechanical properties at room temperature
| Steel grade | Minimum values for the delivery condition a,b | ||||||||||||
| Steel name | Steel number | +C c | +LC c | +SR | +A d | +N | |||||||
| Rm Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH e Mpa | A % | ||
| E215 | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 430 | 215 | 30 |
| E235 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340 to 480 | 235 | 25 |
| E355 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 f | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
Delivery condition:
| BK | BKW | BKS | GBK | NBK | Q+T |
| +C | +LC | +SR | +A | +N | |
| Cold rolled | Cold drawn | Stress relieved | Annealed | Normalized | Quenched+Tempered |
