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Standard | DIN2391, EN10305, ASTM A519, GB/T 3639-200 | ||||||
Material | Q355B Q355D C20,ST52,E355 SAE1026.CK45 4130 4140 STKM 13C | ||||||
Heat treatment | BK+S | ||||||
Specification | Outer diameter(mm) : 40-480mm | ||||||
I.D Tolerance | H8-H9 | ||||||
Length | Fixed Length, Random Length(3--9m)or as requests of customers | ||||||
Straightness | 0.5-1/1000 | ||||||
ID roughness | RA 0.1-0.8micron(max) | ||||||
Payment term | FOB, CFR, CIF ,EXW, FCA and so on | ||||||
MOQ | 3 tons | ||||||
Technology | Honed & SRB(SKIVED AND ROLLER BURNISHED ) | ||||||
Application: | hydraulic cylinder, swivel crane, injection machine and so on | ||||||
Conservation | anti rust oiled inside and outside surface, plastic caps in both ends | ||||||
Package | bundle with steel strip and knitting strip, or wooden case | ||||||
Steel Grade | C | SI | Mn | P | S | Cr | Ni | Cu |
20# | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.250 | 0.250 | |
45# | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.250 | 0.250 | |
Q345B | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 | 0.030 | 0.250 | 0.08 |
Q345D | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 | 0.250 | 0.250 | 0.15 |
25Mn | 0.22-0.29 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 | |||
27SiMn | 0.22-0.32 | 1.10-1.40 | 1.10-1.40 | 0.035 | 0.035 | 0.300 | 0.300 | |
E355 | ≤0.2 | ≤0.55 | ≤1.6 | 0.025 | 0.025 | |||
SAE1026 | 0.22-0.28 | 0.15-0.35 | 0.60-0.90 | 0.040 | 0.050 |
Steel Grade | Rm Mpa | ReH Mpa | Elonggation | cold finished Rm Mpa | cold finished Elonggation |
20# | ≥520 | ≥375 | ≥15 | ≥550 | ≥8 |
45# | ≥600 | ≥520 | ≥10 | ≥640 | ≥5 |
16Mn(Q345B /D) | ≥600 | ≥520 | ≥14 | ≥640 | ≥5 |
25Mn | ≥600 | ≥510 | ≥15 | ≥640 | ≥5 |
27SiMn | ≥760 | ≥610 | ≥10 | ≥800 | ≥5 |
St45 | ≥520 | ≥375 | ≥15 | ≥550 | ≥5 |
E355(st52) | ≥600 | ≥520 | ≥14 | ≥640 | ≥5 |
SAE1026 | ≥600 | ≥510 | ≥15 | ≥640 | ≥5 |
Working method | range | ID | H8 | H9 | H10 |
cold drawn | 25-250 | 30-50 | +0.0390 | +0.0620 | +0.1000 |
cold rolling | 25-150 | 50-80 | +0.0460 | +0.0740 | +0.1200 |
cold drawn-honed | 40-250 | 80-120 | +0.0540 | +0.0870 | +0.1400 |
cold drawn-SRB | 50-250 | 120-180 | +0.0630 | +0.1000 | +0.1600 |
cold drawn -polished | 40-250 | 180-250 | +0.0720 | +0.1150 | +0.1850 |
cold drawn-polish-SRB | 50-250 | as required | as required | as required | as required |









Condition | Materail Grade | T.S (MPa) | Y.S (MPa) | Elongation(%) |
BKS | ST35 (10#) | ≥420 | ≥315 | ≥14 |
BKS | ST45(20#) | ≥520 | ≥375 | ≥12 |
BKS | ST52(16Mn) | ≥580 | ≥420 | ≥10 |
GBK | ST35 (10#) | ≥315 | ≥35 | |
GBK | ST45(20#) | ≥390 | ≥32 | |
GBK | ST52(16Mn) | ≥490 | ≥30 | |
NBK | ST35 (10#) | 340-470 | ≥235 | ≥32 |
NBK | ST45(20#) | 440-570 | ≥255 | ≥30 |
NBK | ST52(16Mn) | 490-630 | ≥335 | ≥28 |






Package | Standard export seaworthy package,suit for all kinds of transport, or as required. |
Water-proof Paper + Edge protection + Wooden Pallets | |
Bulk Size | Any size |
Loading Port | Shanghai Port or any China Seaport |
Container | 1*20ft container load Max. 25 Ton, Max. length 5.8m |
1*40ft container load Max. 25 Ton, Max. Length 11.8m | |
Delivery Time | 7-15 days or according to the order's quantity |


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