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

​​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.