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STANDARD GB/T17396 HOTROLLED SEAMLESS STEEL PIPE FOR HYDRAULIC PILLAR
APPLICATION FOR THE MANUFACTURE OF HYDRAULIC RILLAR

DIMENSION TOLERANCE

ALLOWED TOLERANCE OF OD&W.T. ACCORDING TO GBL17396
PIPE SIZE mm ALLOWABLE TOLERANCE
GENERAL HIGH-GRADE
OD ±1 ±0.75
WT ≤20 ±10%
>20 ±10% ±8
-8

STEEL GRADE AND CHEMICAL COMPOSITION

STEEL GRADE CHEMICAL COMPOSITION%
C Si Mn P S Cr Ni Cu Nb Amount Added
 NOT MORE THAN( % )
20 0.17-0.24 0.17-0.37 0.35-0.65 0.035 0.035 0.25 0.25 0.20
35 0.32-0.40 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.25 0.20
45 0.42-0.50 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.25 0.20
27SiMn 0.24-0.32 1.10-1.40 1.10-1.40 0.035 0.035 0.30 0.35 0.30

MECHANICAL PROPERTIES

NOTE:Special tolerance requirements can be negotiated
STEEL GRADEHEAT TREATMENT ON TEST SPECIMENTENSILE STRENGTH (Mpa)YIELD STRENGTHELONGATIONPERCENTAGE REDUCTION OF AREAAKUZ.J IMPACT ENERGY(≥)BRINELL HARDNESS(≤)
2040024520---
3551030517---
4559033514---
27SiMn920t ±20 WATER QUENCHING 450°C ±50 TEMPER COOLANT: OIL OR WATER980835124039217
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