High Frequency Electric Resistant Welded Square Tubes

Square Tube is one of the main steel pipes used in construction field and machinery industry. 

High Frequency Electric Resistant Welded Square Tubes GR Q235B here mainly refers to the size 

135*135*10mm, which is normally used in cranes making. It is welcomed both at home and abroad. 2.81m 

or 11.25m is the fixed common lengths required by clients. 

In general, square tubes can be divided into 2types :  seamless & ERW . 

From technical pespective, it can be categoried into: cold rolled & hot formed. 

Standards: GB/T3094-2000, GB/T6728-2002, JISG 3466, EN10219, EN10210, ASTM A500, 

——Specification Range

Normal Size

Dia(mm)	T(mm)	Dia (mm)	T(mm)	Dia (mm)	T(mm)
30*30	2-4	120*120	2-14	250*250	8-25
40*40	2-4	125*125	2-14	255*255	8-25
50*50	2-5	130*130	2-14	258*258	8-25
60*60	2-5	135*135	8-14	260*260	8-25
70*70	2-5	140*140	8-20	280*280	8-25
75*75	2-5	150*150	8-22	300*300	9-25
80*80	2-8	160*160	8-22	350*350	9-25
90*90	2-9	180*180	8-22	360*360	9-25
100*100	2-14	200*200	8-25	400*400	9-25
110*110	2-14	220*220	8-25
115*115	2-14	240*240	8-25

Dia(mm)	T(mm)	Dia(mm)	T(mm)	Dia(mm)	T(mm)
60*20	2-3	80*40	2-6	110*60	5-8
60*30	2-3	90*40	2-6	110*70	5-10
60*40	2-6	90*50	2-6	120*60	5-8
70*20	2-3	100*20	2-4	120*80	5-10
70*30	2-3	100*30	2-4	120*100	5-14
70*40	2-6	100*40	2-4	125*90	5-10
70*50	2-6	100*50	2-6	125*100	5-14
75*45	2-6	100*80	4-9	130*120	5-14
				140*80	5-6,8-10

Big Size

Dia (mm)	T(mm)	Dia (mm)	T(mm)	Dia (mm)	T(mm)
180*100	5-14	300*200	7-25	400*250	7-20
200*100	6-18	300*250	7-25	400*300	7-25
200*150	5-6,8-25	320*200	7-25	420*350	7-25
250*100	5-14	350*100	7-18	450*150	7-18
250*200	6-25	350*200	7-25	450*250	7-22
250*225	6-25	350*250	7-25	500*300	7-25
300*100	7-18	350*300	7-25	600*200	7-18
300*150	7-18	400*200	7-18	600*400	8-25