Product Main

Quick Details

Alloy Or Not: Is Alloy
Special Pipe: API Pipe
Surface Treatment: black
Certification: API
Technique: Hot Rolled
Application: Boiler Pipe
Secondary Or Not: Non-secondary
Place of Origin: China (Mainland)
Section Shape: Square
Outer Diameter: 20-60mm
Thickness: 1.0-6.0 mm
Grade: 10#-45#,16Mn,Q195-Q345
Grade: 10#,20#,16Mn,Q215,Q235
Standard: API,GB
Standard: API 5L,GB/T 8163-1999

Specifications

Description

 

Original from China, mild steel square tube was a kind of sqaure hollow section.It is hot rolled and high-frequency welding from HR or CR steel strip & steel coil.

 Square steel pipe normally used for construction,machinery making and steel structural building,ship building,electrical project,agriculture and chemical machinery macking,house building,pressure container,oil stock,bridge building & some other high pressure brackets.

 

Specification

 

Mild steel square tube size list:

Size  (MM) Thinckness (MM) Size (MM) Thinckness (MM) Size  (MM)  Thinckness (MM) Size (MM) Thinckness (MM)
20*20 1.0 

60*60        

50*70        

40*80         

50*80        

70*70        

60*80       

100*40

1.3

120*120  

140*80    

160*80    

75*150  

100*150  

160*60

2.5~2.75

300*450 

300*500 

400*400

4.5~5.75
1.3 1.4 3.0~4.0 7.5~11.75
1.4 1.5 4.25~4.75 12.5~13.75
1.5 1.7 5.25~6.0 14.5~14.75
1.7 1.8 6.5~7.75 15.5~17.75
2.0  2.0 9.5~15

450*450  

200*600 

300*600 

400*500 

400*600 

500*500

4.5~5.75

       25*25        

20*30

1.3  2.2

130*130  

80*180  

140*140  

150*150 

200*100

2.5~2.75 7.5~7.75
1.4  2.5~4.0 3.0~3.25 9.5~9.75
1.5 4.25~5.0 3.5~4.25 11.5~13.75
1.7 5.25~6.0 4.5~9.25 14.5~15.75
1.8   9.5~15 16.5~17.75
2.0

90*90        

75*75        

80*80        

60*90      

60*100     

50*100    

60*120     

50*120    

80*100 

1.3

160*160 

180*180 

250*100 

200*150

2.5~3.25    
2.2 1.5 3.5~5.0    
2.5~3.0 1.7 5.25~7.75    

25*40

30*30

20*40

30*40

            

1.3 1.8 9.5~15    
1.4 2.0

150*250  

100*300 

150*300 

200*200 

135*135

2.75    
1.5 2.2 3.0~3.25    
1.7 2.5~4.0 3.5~7.75    
1.8 4.25~5.0 9.5~12.5    
2.0 5.25~5.75 12.75~15.75    
2.2 7.5~7.75

200*300 

250*250 

100*400 

200*250

3.5~3.75    
2.5~3.0

100*100  

80*120    

125*75    

140*60    

50*150

1.5 4.5~11.75    

25*50

40*40

30*50

30*60

40*50

40*60

50*50 

1.3 1.7 12.5~14.75    
1.4 1.8 15.5~17.75    
1.5 2.0

200*350 

200*400 

300*300 

250*350

4.75~7.75    
1.7 2.2 9.5~11.75    
1.8 2.5~5.0 12.5~14.75    
2.0 5.25~6.0 15.5~17.75    
2.2 6.5~7.75

300*350 

300*400 

350*350 

250*450

4.75~7.75    
2.5~4.0 9.5~13 9.5~11.75    
4.25~5.0   12.5~14.75    
5.25~6.0   15.5~17.75    

 

Grade list:

 

Standard

 

Grade

Method of 

Deoxidization

 

Mechanical Property

(N/MM2) 

Tensile Strength

 

Yield Strength

0(0N140/MM2) 

(A%)Percentage 

Elongation 

after Fracture

Impact Power

≤16 16~40 20℃ 0℃ -20℃

    

GB Standard

Q235B Z 370-500 ≥235 ≥225 ≥26 ≥27    
Q345B Z 470-630 ≥345 ≥325 ≥21 ≥34    
Q420B Z 520-680 ≥420 ≥400 ≥18 ≥34    
Q420C Z 520-680 ≥420 ≥400 ≥19   ≥34  
Q460C Z 550-720 ≥460 ≥440 ≥17   ≥34  

 

JIS Standard

SS400 Z 400-510 ≥245 ≥235 ≥23      
SS540 Z ≥540 ≥400 ≥390 ≥17      

       

EN Standard

S235JR Z 360-510 ≥235 ≥225 ≥26 ≥27    
S235JO Z 360-510 ≥235 ≥225 ≥26   ≥27  
S235J2 Z 360-510 ≥235 ≥225 ≥24     ≥27
S275JR Z 410-560 ≥275 ≥265 ≥23 ≥27    
S275JO Z 410-560 ≥275 ≥265 ≥23   ≥27  
S275J2 Z 410-560 ≥275 ≥265 ≥21     ≥27
S355JR Z 470-630 ≥355 ≥345 ≥22      
S355JO Z 470-630 ≥355 ≥345 ≥22      
S355J2 Z 470-630 ≥355 ≥345 ≥22      

 

ASTM Standard

A36 Z 400-550 ≥250 ≥250 ≥23      
A572-50 Z ≥450 ≥345 ≥345 ≥21      
A572-60 Z ≥520 ≥415 ≥415 ≥18      

 

shipbuilding

A Z 400-520 ≥235 ≥235 ≥22      
B Z 400-520 ≥235 ≥235 ≥22   ≥27