Characteristics for grade 20
Galvanized steel pipe specification, size theoretical weight table
February 14, 2019
Heavy Weight Drill Pipe (HWDP)
April 9, 2019| Grade : | 20 ( 20 ) |
| Substitute: | 15, 25 |
| Classification : | High quality structural carbon steel |
Chemical composition in % for grade 20 ( 20 )
| C | Si | Mn | Ni | S | P | Cr | Cu | As |
| 0.17 – 0.24 | 0.17 – 0.37 | 0.35 – 0.65 | max 0.3 | max 0.04 | max 0.035 | max 0.25 | max 0.3 | max 0.08 |
Temperature of critical points for grade 20 ( 20 ).
| Ac1 = 724 , Ac3(Acm) = 845 , Ar3(Arcm) = 815 , Ar1 = 682 |
Mechanical properties under Т=20oС for grade 20 ( 20 )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| – | mm | – | MPa | MPa | % | % | kJ / m2 | – |
| Sheet heat-treatment, GOST 4041-71 | 4 – 14 | 340-490 | 28 | |||||
| Pipe hot strain, GOST 550-75 | 431 | 255 | 22 | 50 | 780 | |||
| Pipe, GOST 8731-87 | 412 | 245 | 21 | |||||
| Pipe, GOST 10705-80 | 372 | 225 | 22 | |||||
| Rolled stock, GOST 1050-88 | to 80 | 410 | 245 | 25 | 55 | Normalizing | ||
| Rolled stock cold-worked , GOST 1050-88 | 490 | 7 | 40 | |||||
| Rolled stock annealed , GOST 1050-88 | 390 | 21 | 50 | |||||
| Band annealed , GOST 2284-79 | 310-540 | 18 | ||||||
| Band cold-worked , GOST 2284-79 | 490-830 |
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