Grade：ST 52
Size range：
Inside diameter from 40 to
Max length 20 meters.
Straightness: 0.5 /1000
Tolerance EXT: DIN 2391
Tolerance INT: ISO H8
Roughness(Ra): 0.2 to 0.4µ
Type：cold drawing, normalizing treatment, honing.
CHEMICAL COMPOSITION (%)
|
Si (Max) |
Mn (Max) |
C (Max) |
P (Max.) |
S (Max) |
|
0.55 |
1.60 |
0.22 |
0.025 |
0.025 |
MECHANICAL PROPERTIES
|
Tensile strength Min |
Yield Point Min |
Elongation % Min |
|
580 N/mm2 |
420 N/mm2 |
10 |
Marking:
Length: unfixed length or fixed length
Package: banding with steel strips, braiding parcel at outside
Conservation: Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends.
Impact test:
Tolerance standard
|
ID(mm) |
TOLERANCE(mm) |
|||
|
H7 |
H8 |
H9 |
H10 |
|
|
≦30 |
+0.021/0 |
+0.033/0 |
+0.052/0 |
+0.084/0 |
|
30 - ≦50 |
+0.025/0 |
+0.039/0 |
+0.062/0 |
+0.100/0 |
|
50 - ≦80 |
+0.030/0 |
+0.046/0 |
+0.074/0 |
+0.120/0 |
|
80 - ≦120 |
+0.035/0 |
+0.054/0 |
+0.087/0 |
+0.140/0 |
|
120 - ≦180 |
+0.040/0 |
+0.063/0 |
+0.100/0 |
+0.160/0 |
|
180 - ≦250 |
+0.046/0 |
+0.072/0 |
+0.115/0 |
+0.185/0 |
|
250 - ≦315 |
+0.052/0 |
+0.081/0 |
+0.130/0 |
+0.210/0 |
|
315 - ≦700 |
+0.057/0 |
+0.089/0 |
+0.140/0 |
+0.230/0 |
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