Brazil · NBR
1135
ABNT NBR NM 149:1998 — Free cutting steels, normal quality, for general uses in mechanical construction
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.32 | 0.39 | ||
| Mn | 0.5 | 0.9 | ||
| P | 0.06 | |||
| S | 0.15 | 0.25 | ||
| Si | 0.1 | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel tubes, Drawn or drawn and ground, > 10 <= 18 mm | HB 201–262 HB 30 | |||||
| steel tubes, Drawn or drawn and ground, > 18 <= 30 mm | HB 192–255 HB 30 | |||||
| steel tubes, Drawn or drawn and ground, > 3 <= 10 mm | HB 212–277 HB 30 | |||||
| steel tubes, Drawn or drawn and ground, > 30 <= 50 mm | HB 183–241 HB 30 | |||||
| steel tubes, Drawn or drawn and ground, > 50 <= 80 mm | HB 174–235 HB 30 | |||||
| steel tubes, Drawn or drawn and ground, > 80 <= 100 mm | HB 163–212 HB 30 | |||||
| steel tubes, hot rolled or or , > 18 <= 50 mm | HB ≤192 HB 30 | |||||
| steel tubes, hot rolled or or , > 3 <= 18 mm | HB ≤197 HB 30 | |||||
| steel tubes, hot rolled or or , > 50 <= 100 mm | HB ≤187 HB 30 |