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Политика за квалитет

Управување со квалитет

во процесот на производство на профили, цевки, арматурна мрежа и статични носачи за ферт греди

Raw material

Electrowelded tubes and profiles are made of universal construction steel with S 235 JRG 2, S 275 JR and S235J2G3 quality, with regular hemical compositions and define mexanic-tehnikal characteristics.

EN 10025 DIN 17100
S 235 JRG2 R St 37-2
S 235 JO St37-3 U
S 235 J2G3 St 37-3 N
S 275 JR St 44-2
S 275 Jo St 44-3 U
S 275 J2G3 St 44-3 N
S 335 JR -
S335 JO St 52-3 U
S 355 J2G3 St 52-3 N

Allowed tolerance


Tubes and profiles weight, can variate of the weight that is given in the tables, in margine beatween +10% and -8%, and it is calculated according the specific steel weight of 7,85 kg/dm3.


Allowed tolerance for the straight, right angle, hollowness, and modulation is given in the table:

Tubes with rounded section Tubes with square or rectangular section
Outside rate ±1% of outside diametar but not least than ±0,5 мм ±1% of the mesured sides but not least than ±0,5 мм
Wall thickness ±10% with least ±0,2мм outside the welded place and angle of roundness
Right angle - 90° ±1°
Camber or hollownes -  ±1% of sides lenght
Outside angle of roundness - most 3a (a=wall thickness)
Straight 0,2% of total tubes lenght
Modulation - 2mm for the first 1000mm, + 0,5mm for every next 1000mm lenght