Company Profile
Product Description
The process of manufacturing shock absorbers usually starts with selecting high-quality raw materials. The type of raw materials used can significantly affect the performance and lifespan of shock absorbers. Carbon steel seamless steel pipes and alloy seamless steel pipes are commonly used in the production of shock absorbers.These raw materials will undergo a series of processing steps. At these stages, accuracy is crucial to ensure that each component meets the precise specifications required to achieve optimal performance.
Product Parameters
Serial Number
|
Inspection items |
sampling quantity |
| 1 |
chemical composition |
Take one sample from each furnace number |
| 2 |
tensile strength |
Take one sample from each batch of two steel pipes |
| 3 |
hardness |
Take one sample from each batch of two steel pipes |
| 4 |
Non metallic inclusions |
Take one sample from each batch of two steel pipes |
| 5 |
flatten |
Take one sample from each batch of two steel pipes |
| 6 |
flaring |
Take one sample from each batch of two steel pipes |
| 7 |
eddy current testing |
Test one by one |
| 8 |
Internal and external surface roughness |
Take one sample from each batch of two steel pipes |
| GRADE |
chemical composition% |
| C |
Si |
Mn |
Cr |
Ni |
Mo |
Gu |
P |
S |
| 20# |
0.17~0.23 |
0.17~0.37 |
0.35~0.65 |
≤0.25 |
≤0.30 |
---- |
≤0.20 |
≤0.035 |
≤0.035 |
| 45# |
0.42~0.50 |
0.17~0.37 |
0.50~0.80 |
≤0.25 |
≤0.30 |
---- |
≤0.20 |
≤0.035 |
≤0.035 |
| 40Cr |
0.37~0.44 |
0.17~0.37 |
0.50~0.80 |
0.80~1.10 |
≤0.30 |
≤0.1 |
≤0.20 |
≤0.030 |
≤0.030 |
| 40Mn2 |
0.37~0.44 |
0.17~0.37 |
1.40~1.80 |
≤0.30 |
≤0.30 |
≤0.1 |
≤0.20 |
≤0.030 |
≤0.030 |
| 37Mn |
0.30~0.39 |
0.15~0.30 |
1.20~1.50 |
≤0.35 |
≤0.30 |
≤0.1 |
≤0.20 |
≤0.020 |
≤0.015 |
| GRADE |
CONDITION |
| +C |
+LC |
+SR |
+A |
+N |
HRC |
| Rm |
A% |
Rm |
A% |
Rm |
Rel |
A% |
Rm |
A% |
Rm |
Rel |
A% |
| ≤ |
| 20# |
550 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
410 |
245 |
25 |
---- |
| 45# |
645 |
8 |
---- |
---- |
---- |
---- |
---- |
590 |
14 |
600 |
355 |
16 |
---- |
| 40Cr |
780 |
10 |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
22~30 |
| 40Mn2 |
780 |
10 |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
22~30 |
| 37Mn5 |
780 |
12 |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
20~27 |
| OD * ID |
Allowable deviation of outer diameter |
Allowable deviation of inner diameter |
| 18*16 22*20 22.5*20 24*21 39.5*36 |
0/+0.1 |
0/+0.039 |
| 24*20 24*22 30*28 32*30 |
| 26.2*18 27.2*18 28.2*22.7 |
±0.05 |
±0.05 |
| 30.2*25 31.2*24 |
±0.1 |
| 27.2*19 30.2*24 33.2*24 33.2*28 35.2*28 35.2*31 37.2*32 37.3*33 |
-0.15/-0.05 |
| 37.5*32 41.5*37 |
+0.05/+0.15 |
| 26.2*19 26.2*20 30.2*26 32.2*24 37.2*31 41.2*35.8 |
-0.25/-0.05 |
| 30.35*24 37.35*31 |
-0.1/0 |
| Equivalent Material referance: |
| GB |
TOCT |
ASTM |
BS |
JIS |
NF |
DIN |
| 20 |
20 |
1020 |
050A20 |
S20C |
XC18 |
C22,CK22 |
| 45 |
45 |
1045 |
080M46 |
S45C |
XC45 |
C45,CK45 |
| 40Cr |
|
5140 |
41Cr4 |
SCR440 |
41Cr4/38Cr4 |
41Cr4/42Cr4 |
| 40Mn2 |
|
1340 |
|
SMn438 |
|
42Mn6 |
| 37Mn5 |
|
|
|
|
|
|
| Processing |
Cold rolled/ Cold drawn |
| 1. BK (+C) No heat treatment after last cold forming process. |
| 2. BKW (+LC) After last heat treatment there is a light finishing pass ( cold drawing) |
| 3. BKS (+SR) After the final cold forming process the tubes are stress relieve annealed. |
| 4. GBK (+A) After the final cold forming process the tubes are annealed in a controlled atmosphere. |
| 5. NBK (+N) After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere. |
| Packing |
Woven bag/ Wooden or crate carton/ Bundle Packing/ Plain end or vanished as per customer's request. |
| Delivery time |
Normally 30-40 working days |
Certifications
FAQ
Q: Are you trading company or manufacturer?
A: We are professional manufacturer for steel pipes,and our company also is a very professional and technical foreign trade company for steel products. We have more export experience with competitive price and best after-sales service. Apart from this,we can provide a wide range of steel products to meet the requirement of customer.
Q:Will you delivery the goods on time?
A: Yes,we promise to provide best quality products and delivery on time no matter if the price change lot or not. Honesty is our company's tenet.
Q: Do you provide samples ? is it free or extra?
A: The sample could can provide for customer with free,but the freight will be covered by customer account. The sample freight will be returned to customer account after we cooperate.
Q: How can I get your quotation as soon as possible?
A: The email and fax will be checked within 24 hours,meanwhile,Wechat and WhatsApp will be online in 24 hours. Please send us your requirement and order information,specification(Steel grade,size,quantity,destination port),we will work out a best price soon.
Q: Do you have any certifications?
A: Yes,that's what we guarantee to our clients. we have IS09000,IATF16949 certinicate,ISO 14001 certificates etc.Our products are of high quality and we have professional engineers and development team.
Q: What is your terms of payment?
A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipmenit or paid against copy of B/L within 5 working days. 100% Irrevocable L/C at sight is favorable payment term as well.
Q: Do you accept the third party inspection?
A: Yes absolutely we accept.
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