一、Main Materials of Stainless Steel Pipeline
Because of the excellent hygienic performance and mechanical property , stainless steel is very suitable for drinking water , gas and other fluid transport.Selecting pipeline material according to the application fields. According to the national standard <Brand No and Chemical component of Stainless Steel and Heat Resistant Steel> , CHNCON highly recommend 4 common brand materials as following:
Common main chemical components of stainless▼
Code |
Grade No. |
Chemical Components（mass fraction）% |
|||||||
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
||
S30408 |
06Cr19Ni10 |
0.08 |
1 |
2 |
0.045 |
0.03 |
8-11 |
18-20 |
|
S30403 |
022Cr19Ni10 |
0.03 |
1 |
2 |
0.045 |
0.03 |
8-12 |
18-20 |
|
S31608 |
06Cr17Ni12Mo2 |
0.08 |
1 |
2 |
0.045 |
0.03 |
10-14 |
16-18 |
2-3 |
S31603 |
022Cr17Ni12Mo2 |
0.03 |
1 |
2 |
0.045 |
0.03 |
10-14 |
16-18 |
2-3 |
| Noted: The components listed are marked range and minimum value, the rest are maximum | |||||||||
Application Scenarios and Conditions▼
Code |
Grade No. |
Chemical Components（mass fraction）% |
|||||||
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
||
S30408 |
06Cr19Ni10 |
0.08 |
1 |
2 |
0.045 |
0.03 |
8-11 |
18-20 |
|
S30403 |
022Cr19Ni10 |
0.03 |
1 |
2 |
0.045 |
0.03 |
8-12 |
18-20 |
|
S31608 |
06Cr17Ni12Mo2 |
0.08 |
1 |
2 |
0.045 |
0.03 |
10-14 |
16-18 |
2-3 |
S31603 |
022Cr17Ni12Mo2 |
0.03 |
1 |
2 |
0.045 |
0.03 |
10-14 |
16-18 |
2-3 |
| Noted: The components listed are marked range and minimum value, the rest are maximum | |||||||||
二、Main Materials of Carbon Steel Pipeline
Grade No. |
Codea |
Grade |
/mm: Thickness(diameter)/mm |
Deoxidation Method |
Chemical Component（mass fraction）/%， less than |
||||
C |
Si |
Mn |
P |
S |
|||||
Q195 |
U11952 |
- |
- |
F、Z |
0.12 |
0.30 |
0.50 |
0.035 |
0.040 |
Q215 |
U12152 |
A |
- |
F、Z |
0.15 |
0.35 |
1.20 |
0.045 |
0.050 |
U12155 |
B |
0.045 |
|||||||
Q235 |
U12352 |
A |
- |
F、Z |
0.22 |
0.35 |
1.40 |
0.045 |
0.050 |
U12355 |
B |
0.20 b |
0.045 |
||||||
U12358 |
C |
Z |
0.17 |
0.040 |
0.040 |
||||
U12359 |
D |
TZ |
0.035 |
0.035 |
|||||
Q275 |
U12752 |
A |
- |
F、Z |
0.24 |
0.35 |
1.50 |
0.045 |
0.050 |
U12755 |
B |
≤ 40 |
Z |
0.21 |
0.045 |
0.045 |
|||
>40 |
0.22 |
||||||||
U12758 |
C |
- |
Z |
0.20 |
0.040 |
0.040 |
|||
U12759 |
D |
TZ |
0.035 |
0.035 |
|||||
| a There are codes of killed steel , special killed steel in table a , and the codes of rimmed steel as following： Q195F－U11950; Q215AF-U12150,Q215BF-U12153; Q235AF-U12350,Q235BF-U112353; Q275AF-U12750。 b With the buyer’s agreement , the carbon component of Q235B should not more than 0.22% |
|||||||||
三、The main materials of sealing rings
Sealing ring materials▼
EPDM O- type rubber ring
According to GB19228.3-2012<<Stainless Steel Press Fitting Accessory part3 O-type Rubber Ring>> and CJ/T152<Thin Wall Stainless Steel Press Fittings and Groove Fittings>, EPDM rubber ring shall be used as sealing ring material for the designated water supply system.
After the pipeline being pressed into shape，the sealing ring inside R cavity bounced when it was squeezed to make sealing ring fit closely with R cavity ，get a better sealing effect .
good hygienic properties, fully meet the hygienic requirements of wading products
excellent deformation resistance
shore hardness for 80 degree
normal service life is up to 110 years
can withstand high temperature for 110℃
HNBR▼
HNBR has high saturation,good heat resistance,excellent chemical corrosion resistance(good resistance to freon,acid,alkali),excellent ozone resistance ,high compression resistance to permanent deformation performance , has a good stability to all kinds of polar media
四、Comprehensive Performance Comparison of Stainless Steel , Copper Pipe and PPR
The comprehensive performance comparison of all kinds of thin-walled stainless steel pipes
|
performance |
Stainless steel pipe |
Copper pipe |
PPR pipe |
|
|
Hygienic performance |
Environmental Hormone |
No |
No |
Yes |
|
|
Separate out harmful substance |
No Can be implanted into body |
Separate out cu+，low cu+ has bacteriostasis，high cu+ can cause senile dementia（produce blue water） |
Yes， Separate out all kinds of harmful substances |
|
|
Abnormal smell |
No |
No |
Yes |
|
|
Light Transmittance |
No |
No |
Yes Water easy to oxidize in pipeline and easy to grow bacteria |
|
|
Agglomerate impurities |
No impurities,no pollution |
No |
|
|
|
Environmental protection and energy saving |
Environmental friendly and recyclable,save heat energy,low leakage rate |
recycle |
Hard to degrade |
|
Physical Property |
UV resistance |
Excellent |
excellent |
Poor(Severe ultraviolet oxidation, must be dark buried otherwise the service life will less than 20years ) |
|
|
Corrosion Resistance |
Excellent |
Good |
good |
|
|
|
Water flow rate over 10m/s,no obvious corrosion |
Water flow rate over 10m/s,obvious corrosion |
|
|
|
|
No obvious hot water corrosion , temperature can be 100℃ |
When water temperature is higher than 50℃ has obvious corrosion produces blue water |
|
|
|
|
Dissolved oxygen won‘t affect the stainless steel |
Dissolved oxygen will cause copper pipe corrosion |
|
|
|
Temperature Range |
Suitable for -70℃-200℃ |
Suitable for 0℃-50℃ |
5-95℃（easy to pipe cracking when below5℃，performance and life reduction when higher than 60℃） |
|
|
Tensile Strength N/mm2） |
≥520 |
≥210 |
≥49 |
|
|
Coefficient of Thermal Expansion |
17.3 |
17.6 |
When the temperature is higher than40℃，the pipe is easy to be out of shape due to expansion |
|
|
Thermal Conductivity W/m.℃ |
14.5 |
Need to increase the layer thickness not energy saving |
0.48 |
|
Composite Cost |
Appearance |
Gorgeous，suitable for |
Beautiful ， not suitable for |
Low-end，not suitable for |
|
|
Service Life |
Over70years |
Over50years |
20years（actual service life is not same as building life） |
|
|
Main Connection Modes |
Press fitting、Bulge（won‘t produce open flame） |
Weld（produce open flame） |
Hot melting（won‘t produce open flame，affected by environment ， it’s hard to be hot melted and easy to lessen diameter and insufficient weld when below5℃，） |
|
|
Size |
DN15-DN300 |
DN13-DN300 |
DN15-DN100 |
|
|
Construction Degree |
Easy |
More complicated |
More complicated |
|
|
Material purchased cost |
Higher The price ratio between stainless steel and PPR is 2.2:1 |
High The price ratio between copper l and PPR is 2.2:1 |
Low Mainly adopt domestic raw material or recycled material，the price will be higher if adopt imported raw material |
|
|
Cost and Coefficient of construction and installation |
Low |
Pretty higher |
Low |
|
|
Coefficient of Maintenance cost |
1 |
1.2 |
1.5 |
|
|
Composite Cost |
Low |
Pretty lower |
Pretty higher |
Conclusion：In terms of single material cost calculation, PPR is relatively low,but as comprehensive cost including installation cost , daily operation and maintenance cost , service life and other aspects ,PPR is relatively high.Therefore , more and more consumers consider choosing thin wall-ed stainless steel pipe , which is also the reason for the rapid development of thin-walled stainless steel pipe in China.PPR suits for temporary use or consider that material for only a single short-term water supply.
What is stainless steel？
Why is the stainless steel corrosion resistant？
What’s the main materials of stainless steel pipeline ?
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Coated carbon steel pipePlastic-coated carbon steel pipeline is galvanizing in the pipeline's surface and adopting polymer formulation material. After plasticizing and curing , a uniform ,dense and smooth plastic coating is formed on the surface of the pipe and a steel-plastic combination is formed. It not only has the hardness as galvanized steel pipe , but also has the advantages of wear-resistance and corrosion-resistance as plastic pipe. It is a very cost-effective and green energy saving pipes for service life tops 50 years.
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