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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

这是描述信息

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▼

这是描述信息

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 .

Health and Hygiene

good hygienic properties, fully meet the hygienic requirements of wading products

High Elasticity

excellent deformation resistance

High Solidity

shore hardness for 80 degree

Ageing Resistance

normal service life is up to 110 years

Heat-resistance

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

这是描述信息

四、Comprehensive Performance Comparison of Stainless Steel , Copper Pipe and PPR

The comprehensive performance comparison of all kinds of thin-walled stainless steel pipes

Time of issue:2020-07-01 00:00:00
 

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

 

zk

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.

 

 

Category
Pipe material
Ask
Categories:
Pipe material
2020-06-04 16:33:30
Answer

Stainless steel is a steel which is hard to rust for it can produce an invisible but very dense chromium rust called chromium oxide film.That makes the metal in steel has no oxidation with air , water ,acid outside(we call it rust).Stainless steel is an alloy in which the composition of the elements directly determines its corrosion resistance especially nickle and chromium.

Stainless steel is often divided into : martensitic steel , ferritic steel , austenitic steel etc. Thin-walled stainless steel pipelines are generally made of austenitic steel.

Categories:
Pipe material
2020-06-04 16:33:30
Ask
Categories:
Pipe material
2020-06-04 16:33:17
Answer

There is Cr2O3 on its surface.Otherwise if the passivation film is damaged , stainless steel will lose its corrosion resistance.The passivation film has the characteristics of thin and dense,which can reflect the original color of the metal.

Categories:
Pipe material
2020-06-04 16:33:17
Ask
Categories:
Pipe material
2020-06-04 16:33:06
Answer

Stainless steel has been developed to more than 100grades. L stands for ultra-low carbon, carbon content of 304 is lower than 0.08%, carbon content of 304L means lower than 0.03%.When argon is not well protected , carbon and chromium will form carbolochrome compounds thus the content of chromium oxide (Cr2O3) will be relatively reduced , and the corrosion resistance will be reduced. On the contrary , less carbon content and less carbolochrome compound , better corrosion resistance.

Categories:
Pipe material
2020-06-04 16:33:06
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