Pipe material
Zhejiang Zhengkang Industrial Co., Ltd.

Pipe material

Main material of 1. stainless steel pipe

Stainless steel pipes are very suitable for fluid transmission pipeline systems such as drinking water and gas due to their good sanitary and mechanical properties. The corresponding pipe materials should be selected according to the specific application scenarios. According to the national standard of "stainless steel and heat-resistant steel grades and chemical composition", Zhengkang mainly recommends the following four common grades of materials:

Common stainless steel main chemical composition content ▼

Digital Code
Brand
Chemical composition (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
Note: The ingredients listed in the table indicate the range and minimum value, and the rest are the maximum value.

Application scenarios and conditions ▼

Digital Code
Brand
Chemical composition (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
Note: The ingredients listed in the table indicate the range and minimum value, and the rest are the maximum value.
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Main material of 2. carbon steel pipe

Brand Uniform digital codea Grade Thickness (or diameter)/mm deoxidation method Chemical composition (mass fraction)/%, no more
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 0.20b 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

aThe table is the unified number of the killed steel and special killed steel grades, and the unified number code of the boiling steel grade is as follows:
Q195F－U11950;
Q215AF-U12150,Q215BF-U12153;
Q235AF-U12350,Q235BF-U112353;
Q275AF-U12750。
bWith the consent of the buyer, the carbon content of Q235B may not be greater than 0.22%.
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III. Main Material of Sealing Ring

Sealing ring material ▼

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EPDM O-ring
In GB/T 19228.3-2012 "Stainless Steel Clasp Pipe Fittings Part 3 O-Type Rubber Sealing Ring" and CJ/152-2016 "Thin-walled Stainless Steel Clasp and Groove Pipe Fittings", the specified water supply system shall adoptEPDM rubberAs sealing ring material.
After the pipe is crimped and formed, the sealing ring is squeezed in the R oral body to generate a rebound force, so that the sealing ring is more closely fitted to the R oral body, and the sealing effect is better.

Health and Hygiene

Good health performance, fully meet the requirements of water products

High elasticity

Excellent deformation resistance

High hardness

Shore hardness 80

anti-aging

Normal service life of up to 110 years

High temperature resistance

Can withstand 100 ℃ high temperature

Hydrogenated nitrile rubber ▼

HNBR has high saturation, good heat resistance, excellent chemical corrosion resistance (good resistance to Freon, acid and alkali), excellent ozone resistance, high compression deformation resistance, and good stability to various polar media.

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Main material of 2. carbon steel pipe

  Performance Stainless steel pipe Copper pipe PPR pipe
Hygienic performance environmental hormone None None Yes
precipitation of harmful substances None (implantable in human body) Cu precipitation, when Cu is low, it has antibacterial effect, but when the concentration is high, it is easy to cause Alzheimer's disease (blue water) Yes (precipitation of harmful substances from various additives)
Odor None None Yes
Light transmittance opaque opaque Light transmission (the water in the pipe is easy to oxidize and bacteria multiply)
Quality of raw materials Domestic, stable performance, can meet performance requirements, sufficient sources of raw materials. Is a strategic material, the use of restricted, domestic generally recycled copper, domestic raw materials quality than abroad there is a gap. Need to import (but the domestic almost no use of imported raw materials, mainly because of the price, if the use of imported raw materials, the product is expensive, most manufacturers even use recycled raw materials.)
impurity condensation No impurity condensation, no water pollution None Yes
Environmental protection and energy saving Environmentally friendly and recyclable, saving heat energy and low leakage rate Recyclable Not easy to degrade
Physical Performance Ultraviolet resistance Excellent Excellent Poor (UV oxidation is serious and must be buried, otherwise the life span is less than 20 years)
Corrosion resistance Excellent Good Good
Water flow rate above 10 m/s no obvious corrosion Water flow rate above 1.5 m/s corrosion is obvious
Hot water circulation corrosion is not obvious, the temperature can reach 100 ℃ When the water temperature is higher than 50 ℃, the circulation corrosion of hot water is obvious, resulting in blue water
Dissolved oxygen does not affect stainless steel Copper pipe corrosion caused by dissolved oxygen
Applicable range of temperature -70 ℃-200 ℃ can be used 0 ℃-50 ℃ can be used 5-95 ℃ (below 5 ℃ easy to embrittlement burst, higher than 60 ℃ performance and service life reduced)
Tensile strength (N/m
m2)		 ≥ 520 ≥ 210 ≥ 49
Coefficient of thermal expansion
(0-100 ℃)(10-6/℃)		 17.3 17.6 70 (When the temperature is high and 40 ℃, the pipeline is easy to deform due to expansion)
Thermal conductivity W/m. ℃ 14.5 383.8 need to increase the thickness of the insulation layer, no energy saving 0.48
comprehensive cost Appearance gorgeous, suitable for open dress more beautiful, but not suitable for surface low-grade, not suitable for open dress
Service life More than 70 years More than 50 years 20 years (actual service life, not with the life of buildings, etc.)
Main connection mode Card press connection and card convex connection (no open flame) Welding (open flame) Hot melt (no open flame, but affected by ambient temperature, less than 5 ℃ is not easy to hot melt, and easy to shrink diameter, virtual welding)
Dimensions DN15-DN300 DN13-DN300 DN15-DN100
construction difficulty Simple more complex more complex
Material procurement cost Higher
Material cost
And PPR pipe price ratio is
2.2：1		 High
Material cost
The ratio to the PPR price is
4:1		 Low (mainly using domestic raw materials or recycled materials, such as imported raw materials, the price is higher)
Construction and installation cost coefficient Low 1 Higher 1.2 Low 1
Maintenance cost factor 1 1.2 1.5
comprehensive cost Low Lower Higher
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Summary: Single material cost calculation, PPR is low, but including installation costs, daily operation and maintenance costs, service life and other comprehensive costs, PPR comprehensive cost is higher, so more and more consumers consider the use of thin-walled stainless steel pipe, which is also the reason for the rapid development of thin-walled stainless steel pipe in China. PPR is suitable for temporary use or only consider a single short-term water supply pipe material.

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What are the main thin-walled stainless steel pipes?

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What are the main materials of thin-walled stainless steel pipes? Stainless steel has developed to more than 100 grades, and L represents ultra-low carbon. 304 carbon content is less than 0.08, 304L carbon content is less than 0.03, argon protection is not good, carbon and chromium will form carbon chromium compounds, thus forming chromium oxide (Cr2O3) content is relatively reduced, weld corrosion resistance decreased. The lower the carbon content, the less carbon chromium compounds formed in the weld, and the better the corrosion resistance of the weld.
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Why is stainless steel resistant to corrosion?

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Stainless steel corrosion resistance is because the surface has a layer of chromium-rich oxide film (Cr2O3), on the contrary, if the passivation film is destroyed, stainless steel will lose corrosion resistance. The passivation film is thin and dense, which can reflect the true color of the metal.
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What is stainless steel?

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What is stainless steel? Stainless steel is steel that is not easy to rust. The reason why stainless steel does not produce rust is that it can produce an invisible but very dense chromium rust, that is, the oxide film of chromium, which isolates the metal in the steel from the outside air, water, acid, etc. without oxidation reaction (that is, rust); Stainless steel is an alloy steel, and the composition of various elements in it directly determines the corrosion resistance of stainless steel, in particular, nickel elements and chromium elements. Stainless steel is often divided into: martensitic steel, ferritic steel, austenitic steel, etc., thin-walled stainless steel pipes are generally made of austenitic steel as raw materials.
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Whether it is stainless steel pipe or crimped zinc-plastic carbon steel pipe, it is more expensive than traditional materials?

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The cost of installation and use of stainless steel piping systems includes not only the cost of product procurement, but also the cost of installation and maintenance, as well as the cycle cost of replacing the piping system during the life cycle of the main building. Compared with traditional products, stainless steel pipes and crimped zinc-plastic carbon steel pipes have the characteristics of corrosion resistance, long life, and maintenance-free, which reduces maintenance and cycle costs, and has low comprehensive costs. It is a once-and-for-all choice.
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What are the principles and advantages of crimping?

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The crimping type is a connection mode in which the pipe is inserted into the socket of the pipe fitting containing the O-ring seal, and the socket is pressed with a special crimping tool. It has the characteristics of excellent sealing performance, simple and convenient installation (a joint can be installed in only 5-7 seconds) and strong pull-out resistance.
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What are the disadvantages of traditional galvanized pipes in the field of gas and fire protection?

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①Easy to corrode, short service life, and during use, anti-corrosion paint needs to be applied to the outer wall every 2-3 years, and the maintenance cost is high ② Galvanized pipes are generally connected by threaded reaming, which takes a long time to install, is difficult, and the amount of auxiliary materials to install is large, and the threaded connection is a live connection, so there is a risk of stealing the pipeline.