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| Why you choose us? |
| 1. more than 20 years experiences in steel business |
| 2. good quality |
| 3. competitive price |
| 4. meet your needs via reprocessing |
| 5. excellent service |
| 6. short delivery time |
| 7. long mutual beneficial business cooperation |
Product description
1. Description: Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part of a piece of hydraulic cylinder.
2. Commodity: SAE1045 cold drawn seamless honed tube
3. Size range: 40mm*30mm-580mm*500mm
4. Available steel grade:
Standard specification&steel grade:
| EN 10305-1 |
25CrMo4, 34CrMo4, 42CrMo4, |
| ASTM A519 |
4130, 4140, 4145, 4340, 8620 |
| JIS |
STKM 13A, STKM 13B, STKM 13C |
| GB |
20CrMo,30CrMo,35CrMo,42CrMo, |
5. Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring
6. Delivery condition:
| BK |
BKW |
BKS |
GBK |
NBK |
Q+T |
| +C |
+LC |
+SR |
+A |
+N |
| Cold rolled |
Cold drawn |
Stress relieved |
Annealed |
Normalized |
Quenched+Tempered |
7. Bore treatment: Honing, skiving&roller burnishing
8. Bore roughness control: Ra0.25um max or Ra0, 35um max for honed tubes, Ra0.25um max for skived&roller burnished tubes.
9. End finish: Plain ends with square cuts, free of burrs for honed tubes. Little bevelled ends for skived&roller burnished tubes.
10. Standard export packing: In bundles tied with steel strips. Int&ext oil coating. End plastic caps. External packing by PVC bags and knit bags.
11. Customized packing and marking can be provided upon request.
12. H8 tolerance:
| ID range |
Tolerance |
ID range |
Tolerance |
| 18< d ≤30 |
+0/+0.033 |
180< d ≤250 |
+0/+0.072 |
| 30< d ≤50 |
+0/+0.039 |
250< d ≤300 |
+0/+0.081 |
| 50< d ≤80 |
+0/+0.046 |
300< d ≤315 |
+0/+0.081 |
| 80< d ≤120 |
+0/+0.054 |
315< d ≤400 |
+0/+0.089 |
| 120< d ≤180 |
+0/+0.063 |
400< d ≤500 |
+0/+0.097 |
13. Difference between honed tube and skived&roller burnished tube: In hydraulic cylinder industry, there are 2 solutions for bore treatment: Honing, and skiving&roller burnishing. Honing or skiving&roller burnishing leads to different internal surface image, but both ensure good roughness.
1. Description: Honing is a kind of machining technology. Through honing head, the inner hole of cold drawn pipe is processed by reciprocating high-speed grinding technology, so that the inner hole can meet the requirements of tolerance size and surface roughness that we need.
Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part of a piece of hydraulic cylinder.
2. Commodity: 42CrMo4 Precision Cold Drawn Honed Pipe
3. Size range: Inside diameter: 25mm -500mm; Wall thickness: 2-50mm
4. Available steel grade:
| SAE/AISI: |
SAE1020, SAE1026, SAE1045, SAE4130, SAE4140 |
| DIN: |
ST52, ST52.3, ST52.4 |
| EN: |
E355, C45E, 25CrMo4, 42CrMo4, CK45, S45C, E410, E470 |
| GB: |
20#, 45#, 16Mn, Q345B, Q345C, Q345D, Q345E, 25Mn, 27SiMn, |
5. Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring
6. Delivery condition:
| BK |
BKW |
BKS |
GBK |
NBK |
Q+T |
| +C |
+LC |
+SR |
+A |
+N |
| Cold rolled |
Cold drawn |
Stress relieved |
Annealed |
Normalized |
Quenched+Tempered |
7. Bore treatment: Honing, skiving&roller burnishing
8. Bore roughness control: Ra0.25um max or Ra0, 35um max for honed tubes, Ra0.25um max for skived&roller burnished tubes.
9. End finish: Plain ends with square cuts, free of burrs for honed tubes. Little bevelled ends for skived&roller burnished tubes.
10. Standard export packing: In bundles tied with steel strips. Internal & external oil coating. Plastic caps on both ends. External packing by PVC bags and knit bags.
11. Customized packing and marking can be provided upon request.
12. H8 tolerance:
| ID range |
Tolerance |
ID range |
Tolerance |
| 18< d ≤30 |
+0/+0.033 |
180< d ≤250 |
+0/+0.072 |
| 30< d ≤50 |
+0/+0.039 |
250< d ≤300 |
+0/+0.081 |
| 50< d ≤80 |
+0/+0.046 |
300< d ≤315 |
+0/+0.081 |
| 80< d ≤120 |
+0/+0.054 |
315< d ≤400 |
+0/+0.089 |
| 120< d ≤180 |
+0/+0.063 |
400< d ≤500 |
+0/+0.097 |
13. Difference between honed tube and skived & roller burnished tube: In hydraulic cylinder industry, there are 2 solutions for bore treatment: Honing, and skiving&roller burnishing. Honing or skiving&roller burnishing leads to different internal surface image, but both ensure good roughness.
Chemical composition(%) of precision pipe's commin grade
| Standard |
Grade |
C |
Si |
Mn |
s |
p |
Cr |
GB/T 699
GB/T 3639
GB3077
GB/T1591
GB/T 8163-2018 |
10# |
0.07~0.13 |
0.17~0.37 |
0.35~0.65 |
≤0.035 |
≤0.035 |
\ |
| 20# |
0.17~0.23 |
0.17~0.37 |
0.35~0.65 |
≤0.035 |
≤0.035 |
\ |
| 35# |
0.32~0.39 |
0.17~0.37 |
0.35~0.65 |
≤0.035 |
≤0.035 |
\ |
| 45# |
0.42~0.50 |
0.17~0.37 |
0.50~0.80 |
≤0.035 |
≤0.035 |
\ |
| 40Cr |
0.37~0.44 |
0.17~0.37 |
0.50~0.80 |
≤0.035 |
≤0.035 |
0.08~1.10 |
| 25Mn |
0.22~0.29 |
0.17~0.37 |
0.70~1.00 |
≤0.035 |
≤0.035 |
≤0.25 |
| Q345B |
≤0.20 |
≤o.50 |
≤1.7 |
≤0.035 |
≤0.035 |
≤0.3 |
| 37Mn5 |
0.30~0.39 |
0.15~0.30 |
1.20~1.50 |
≤0.015 |
≤0.020 |
\ |
Conventional mechanical properties of precision pipe
| Standard |
Grade |
Delivery Conditions |
| BK(hard) |
BKW(soft) |
| Tensil Stength(Mpa) |
Make percentage elongation(%) |
Tensile stength(Mpa) |
Make percentage elongation(%) |
GB/T 3639
GB 3077 |
20# |
≥550 |
≥10 |
≥490 |
≥15 |
| 25Mn |
≥600 |
≥12 |
≥540 |
≥15 |
| Q345B |
≥620 |
≥12 |
≥550 |
≥15 |
| 45# |
≥645 |
≥8 |
≥625 |
≥15 |
| 40Cr |
≥784 |
≥14 |
\ |
\ |
| 37Mn5 |
≥784 |
≥14 |
\ |
\ |
Dimensional tolerances of inner diameter
| Standard |
Inner Diameter(mm) |
Inner Diameter Deviation(mm) |
| GB1801-79 |
H7 |
H8 |
H9 |
H10 |
| 30 |
0~+21 |
0~+33 |
0~+52 |
0~+84 |
| 30-50 |
0~+25 |
0~+39 |
0~+62 |
0~+100 |
| 50-80 |
0~+30 |
0~+46 |
0~+74 |
0~+120 |
| 80-120 |
0~+35 |
0~+54 |
0~+87 |
0~+140 |
| 120-180 |
0~+40 |
0~+63 |
0~+100 |
0~+160 |
| 180-250 |
0~+46 |
0~+72 |
0~+115 |
0~+185 |
| 250-315 |
0~+52 |
0~+81 |
0~+170 |
0~+210 |
| 315-400 |
0~+57 |
0~+89 |
0~+140 |
0~+230 |
Packing and shipping
Company information
Tianjin Boer King Steel is a professional trading company and has been in steel industry for more than 15years, specializing in seamless steel pipe,oil casing/drill pipe, galvanized steel pipe, stainless steel pipe,ERW/SSAW/LSAW/ welded pipe.
Also we sale hot and cold rolled steel coils,steel plates,galvanized steel coils, all kinds of profiles like H-beam, Angel bar,C profile etc.
We have established long term cooperations with several famous steel manufactures all over the world, and we can offer you best quality products with competitive price which will give you an edge over your competitors.
Besides, we offer best service all the time.We will do our best to satisfy you needs for the products. Our products have been sold in many countries and areas of the world including South America, Iran, Kenya, Israel etc, and our export volume reaches 160,000tons per year.
We execute quality gurantee system ISO 9001,2008 strictly and all certicates and the third party inspection like MTC,API,ABS,ISO9001,SGS BV etc. will be provided as client's requirements.
FAQ
Q1:How about the quality?
A:Third party inspections are always welcomed, like TUV, BV, SGS. All of the goods will be released together with MTC and stamped by TPI.
Q2: Can you accept customization?
A: Yes.we can do customization for you.
Q3: Do you provide samples? Free or not?
A: Yes, we could offer the sample for free but do not pay the cost of freight.
Q4: How long is the delivery time?
A: Generally about 5-10 days if the goods in stock. Or will be 15-30 days if not in stock.
Q5: How about the trade terms?
A: EXW, FOB, CFR, CIF, LC will be accepted.
Contact: Cindy yang(86-136-220-11-358)
Boer King Steel Group
Tianjin Boer King Steel Pipe Co.,Ltd
Tianjin Boer King Steel Co.,Ltd
Add: No.602,Shuanggang Development Zone,Tianjin,300350 China.
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