Each standard of steel pipe has its own performance characteristics.
一、Core features of each standard steel pipe
A36（structural steel）
. Characteristics：low cost、easy to weld、suitable for general buildings and structural parts.
. Notice：The tensile strength range is wide (400-550 MPa), and the actual use needs to select the strength grade according to the specific project.A106（Seamless boiler pipes）
. Characteristics：Designed for high temperature and high pressure (such as boiler superheater), low carbon content, temperature must be controlled during welding to avoid cracks.
. Comparison：other standards of steel pipes are more suitable for high temperature, but higher cost.
A53（welding steel pipes）
. Characteristics：economical,suitable for low pressure flow(such us water pipes)，The compressive strength is weak and not suitable for high temperature and high pressure.
2. GB national standard（China）
GB/T 700（Q235）
. Charcteristics：The most commonly used structural steel in China, with good plasticity and convenient welding, is widely used in construction and machinery manufacturing.
. Limitations: Average corrosion resistance, not suitable for chemical environment.
GB/T 8163（Fow fluid seamless pipes）
. Characteristics：The inner surface is smooth and corrosion-resistant, suitable for petroleum and chemical fluid transportation, but the strength is lower than that of high-pressure boiler tubes.
. Comparison：More emphasis on inner surface quality than A106, suitable for long-term conveying of media.
GB 5310（High pressure boiler pipes）
. Characteristics：include Cr、Mo alloy,High temperature oxidation resistance, high compressive strength, but the cost is significantly higher than ordinary boiler tubes.
3. JIS standard（Japan）
STKM 11A（structural seamless tubes）
.Characteristics：Good cold processing performance, suitable for scenes that require forming, such as automotive parts.
. Notice：The strength is slightly lower than ASTM A36, but the weldability is better.
.SB265（Heat exchange tubes）
.characteristics：High cleanliness, stress corrosion resistance, suitable for chemical heat exchangers, but requires high processing accruacy
4. ISO standard（international）
· ISO 3183（oil and gas pipeline）
. Characteristics：high strength（X42-X80 classification），resistant to hydrogen sulfide corrosion, suitable for long-distance high-pressure oil and gas transportation.
. Tip points：Commonly used in submarine pipelines or extreme environments, requiring strict testing standard.
二、Performance comparison and selection logic
1. Strength and tempaerature
|
Scenery |
rocommended standards |
Reason |
|
Usual building |
ASTM A36 / GB/T 700 |
low cost, easy to process |
|
High temperature and pressure |
ASTM A106 / GB 5310 |
The alloy is reinforced and can withstand more than 400 degrees. |
|
Low temperature or corrosive |
ISO 3183（X60+） |
H₂S corrosion resistance, high strength |
2.Welding and processing
· Easy to be weld:A36、GB/T 700（No need special process）。
· Be careful：A106（high temperature welding is prone to cracking）、SB265（high precision required）.
3. Economy
· Low cost：A53（low pressure flow fluid）、STKM 11A（usual structural parts).
· High investment：GB 5310（Alloy cost）、ISO 3183（testing and materials).
三、Details that are easily overlooked
1. Seamless vs welding
2. seamless tubes（such us GB/T 8163）more uniform inner wall，suitable for flow fluid ,welding tubes（such as A53）low cost，But there may be weld weaknesses.
The function of alloying elements
.(Cr）：Improving Improve antioxidant properties（such as GB 5310）.
.(Mo）：Enhanced corrosion resistance and high temperature strength(such us ISO 3183）.
Environmental adaptability
. Chloride ion environment (such as seawater): stainless steel or high chromium steel pipes are preferred.
. Sour oil and gas: X60/X70 grade steel pipes resistant to H₂S corrosion must be used (ISO 3183).
Summerize
The selection of steel pipes should focus on three key points: strength requirements(Temperature / pressure), material compatibily(corrosiveness of the medium),and economy.For example:
Chemical flow fluid transportation → GB/T 8163（Smooth inner surface） > A53（low cost but prone to corrosion）.
We Baodely Huaian Metal Technology Co.,Ltd. is a professional factory fo carbon steel pipes, below is our contact, do not hesitate to contact us for any needs.
