INTERSTATE STANDARD
HOT ROLLED STEEL HEXAGONAL
Range
INTERSTATE STANDARD
Date of introduction 01.01.90
1. This standard applies to hot-rolled steel hexagonal section with inscribed circle diameter a from 8 to 100 mm.
2. According to the rolling accuracy, rolled products are produced:
B - increased accuracy;
B - normal accuracy.
3. The diameters of the inscribed circle of rental, the maximum deviations for them, the cross-sectional area and the mass of 1 m of length must correspond to those indicated in the drawing and in table. 1.
Table 1
4. Rolled products are made in bars. By agreement between the manufacturer and the consumer, rolled products are produced in coils.
5. Rolled products are manufactured in lengths from 2 to 6 m:
measured length;
multiple measured length;
unmeasured.
At the request of the consumer, rolled products are made in lengths from 1.5 to 12 m.
6. Limit deviations along the length of a measured or multiple measured length should not exceed:
+30 mm - up to 4 m;
+50 mm - with a length of St. 4 to 6 m;
+70 mm - over 6 m.
At the request of the consumer +40 mm - for rolled products with a length of St. 4 to 7 m;
+5 mm for each meter of length over 7 m.
7. The difference in dimensions between parallel edges ( a ) of rolled products in the same section should not exceed 75% of the sum of the maximum deviations.
At the request of the consumer, the difference between the edges ( a ) in the same section of rolled products of normal accuracy should not exceed 70% of the sum of the maximum deviations for rolled products with dimensions up to 32 mm inclusive.
8. The bluntness of the corners for the rental of a hexagonal section should not exceed the values indicated in table. 2.
Table 2
Dimensions, mm
At the request of the consumer, blunting of corners should not exceed 1.0 mm for rolled products with an inscribed circle diameter of 15 - 20 mm inclusive, from 26 to 30 mm inclusive - no more than 1.5 mm, from 60 - 75 mm inclusive - no more than 2.5 mm.
9. The curvature of the rods of hexagonal rolled products should not exceed the values indicated in table. 3.
Table 3
Dimensions, mm
10. At the request of the consumer, the curvature of hexagonal bars should not exceed 0.2% of the length.
11. The curvature of rolled products is measured over a length of at least 1 m at a distance of at least 150 mm from the ends.
12. The twisting of hexagonal rolled products should not exceed the product of 4 deg /m by the profile length in meters, but not more than 24 deg with an inscribed circle diameter of up to 14 mm and over 14 mm up to 50 mm inclusive - 3 deg /m per profile length in meters, but not more than 18 degrees, over 50 mm - 3 degrees /m per profile length in meters, but not more than 15 degrees.
13. The dimensions of the rolled stock and the bluntness of the corners are measured at a distance of at least 150 mm from the end of the bar and at least 1.5 m from the end of the coil with a mass of up to 250 kg and at a distance of at least 3.0 m with a coil mass of over 250 kg.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the USSR State Committee for Standards
2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the USSR State Committee for Standards dated 06.29.88 No. 2557
3. The standard fully complies with ST SEV 3897-82
4. REPLACE GOST 2879-69
5. The limitation of the validity period was lifted according to the protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)
6. REPUBLIC
GOST 2879-88
