Nominal Size of Pipe | Minimum Thickness of Normal(n)Coating ,in mm |
Up to DN100 | 1.8 |
Over DN100 up to DN250 | 2.0 |
Over DN250 to Below DN500 | 2.2 |
From DN500 to Below DN800 | 2.5 |
From DN800 | 3.0 |
The minimum coating thickness shall be 0.7mm greater (reinforced(v)type)where coatings will be subjected to particularly high mechanical stress. Along any 1m length of pipe,the coating thickness maybe up to 10% less than the minimum required,provded the thinner area does not cover more than 5cm2 |
|
Steel grade | Delivery condition |
BNS(L245NS) | Normalizing rolled, normalizing formed, normalized, normalized and tempered |
X42NS(L290NS) | Normalizing rolled, normalizing formed, normalized, normalized and tempered |
X46NS(L320NS) | Normalizing rolled, normalizing formed, normalized, normalized and tempered |
X52NS(L360NS) | Normalizing rolled, normalizing formed, normalized, normalized and tempered |
BQS(L245QS) | Quenched and tempered |
X42QS(L290QS) | Quenched and tempered |
X46QS(L320QS) | Quenched and tempered |
X52QS(L360QS) | Quenched and tempered |
X56QS(L390QS) | Quenched and tempered |
X60QS(L415QS) | Quenched and tempered |
Steel Grade | Strtch Performance | Impact energy(J) |
Hardness | ||||
Yield strength | Tensile strength | Elongation | |||||
Mpa | Mpa | % | Min | Max | |||
Min | Max | Min | Max | ||||
BNS(L245NS) BQS(L245QS) | 245 | 450 | 415 | 760 | As per standard |
27 | 22HRC OR 250HV10 |
X42NS(L290NS) X42Q(L290QS) | 290 | 495 | 415 | 760 | 27 | ||
X46NS(L320NS) X46Q(L320QS) | 320 | 525 | 435 | 760 | 27 | ||
X52NS(L360NS) X52Q(L360QS) | 360 | 530 | 460 | 760 | 27 | ||
X56QS(L390QS) | 390 | 545 | 490 | 760 | 27 | ||
X60QS(L415QS) | 450 | 600 | 520 | 760 | 27 |