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These standard specifications apply for hot-rolled round steel bars with the diameter from 5 to 270 mm. inclusively.
Hot-rolled round steel bars with the diameter exceeding 270 mm can be manufactured by agreement with the client.
Acc In terms of the rolling accuracy, round bars are subdivided for:

• Letter “А” - high accuracy;
• Russian Letter “Б” - enhanced accuracy;
• Russian Letter “В” - standard accuracy.

Diameters of round bars, their threshold deviations, cross-section area, and mass of 1 m of their length shall correspond to the table data (calculated and verified in Excel).

 

Diameter, mm	Rolling Accuracy Threshold  Deviation, mm			Cross Section Area, mm2	1M Weight, kg	Meters per Ton
	А	Б	В
Rolls
5.0	+0.1 -0.2	+0.1 -0.5	+0.3 -0.5	19.63	0.154	6487.8
5.5				23.76	0.187	5361.9
6.0				28.27	0.222	4505.4
6.3				31.17	0.245	4086.6
6.5				33.18	0.260	3839.0
7.0				38.48	0.302	3310.1
8.0				50.27	0.395	2534.3
9.0				63.62	0.499	2002.4
Plain Bars
0.0	+0.1 -0.3	+0.1 -0.5	+0.3 -0.5	78.54	0.617	1622.0
11.0				95.03	0.746	1340.5
12.0				113.10	0.888	1126.4
13.0				132.73	1.042	959.7
14.0				153.94	1.208	827.5
15.0				176.71	1.387	720.9
16.0				201.06	1.578	633.6
17.0				226.98	1.782	561.2
18.0				254.47	1.998	500.6
19.0				283.53	2.226	449.3
20.0	+0.1 -0.4	+0.2 -0.5	+0.4 -0.5	314.16	2.466	405.5
21.0				346.36	2.719	367.8
22.0				380.13	2.984	335.1
23.0				415.48	3.261	306.6
24.0				452.39	3.551	281.6
25.0				490.87	3.853	259.5
26.0	+0.1 -0.4	+0.2 -0.7	+0.3 -0.7	530.93	4.168	239.9
27.0				572.56	4.495	222.5
28.0				615.75	4.834	206.9
29.0	+0.1 -0.5			660.52	5.185	192.9
30.0				706.89	5.549	180.2
31.0			+0.4 -0.7	754.77	5.925	168.8
32.0				804.25	6.313	158.4
33.0				855.30	6.714	148.9
34.0				907.92	7.127	140.3
35.0				962.11	7.553	132.4
36.0				1017.88	7.990	125.2
37.0				1075.21	8.440	118.5
38.0				1134.11	8.903	112.3
39.0				1194.96	9.378	106.6
40.0				1256.64	9.865	101.4
41.0				1320.25	10.364	96.5
42.0				1385.44	10.876	91.9
43.0				1452.20	11.400	87.7
44.0				1520.53	11.936	83.8
45.0				1590.43	12.485	80.1
46.0				1661.90	13.046	76.7
47.0				1734.90	13.619	73.4
48.0				1809.56	14.205	70.4
50.0	+0.1 -0.7	+0.2 -1.0	+0.4 -1.0	1963.50	15.413	64.9
52.0				2123.72	16.671	60.0
53.0				2206.18	17.319	57.7
54.0				2290.22	17.978	55.6
55.0				2375.83	18.650	53.6
56.0				2463.01	19.335	51.7
58.0				2642.08	20.740	48.2
60.0	+0.1 -0.9	+0.3 -1.1	+0.5 -1.1	2827.43	22.195	45.1
62.0				3019.07	23.700	42.2
63.0				3117.25	24.470	40.9
65.0				3318.31	26.049	38.4
67.0				3525.65	27.676	36.1
68.0				3631.68	28.509	35.1
70.0				3848.45	30.210	33.1
72.0				4071.50	31.961	31.3
75.0				4417.86	34.680	28.8
78.0				4778.36	37.510	26.7
80.0	+0.3 -1.1	+0.3 -1.3	+0.5 -1.3	5026.55	39.458	25.3
82.0				5281.02	41.456	24.1
85.0				5674.50	44.545	22.4
87.0				5944.68	46.666	21.4
90.0				6361.73	49.940	20.0
92.0				6647.61	52.184	19.2
95.0				7088.22	55.643	18.0
97.0				7389.81	58.010	17.2
100.0	-	+0.4 -1.7	+0.6 -1.7	7853.98	61.654	16.2
105.0				8659.01	67.973	14.7
110.0				9503.32	74.601	13.4
115.0				10386.89	81.537	12.3
120.0	-	+0.6 -2.0	+0.8 -2.0	11309.73	88.781	11.3
125.0				12271.85	96.334	10.4
130.0				13273.23	104.195	9.6
135.0				14313.88	112.364	8.9
140.0				15393.80	120.841	8.3
145.0				16513.00	129.627	7.7
150.0				17671.46	138.721	7.2
155.0				18869.19	148.123	6.8
160.0	-	-	+0.9 -2.5	20106.19	157.834	6.3
165.0				21382.46	167.852	6.0
170.0				22698.01	178.179	5.6
175.0				24052.82	188.815	5.3
180.0				25446.90	199.758	5.0
185.0				26880.25	211.010	4.7
190.0				28352.87	222.570	4.5
195.0				29864.77	234.438	4.3
200.0				31415.93	246.615	4.1
210.0	-	-	+1.2 -3.0	34636.06	271.893	3.7
220.0				38013.27	298.404	3.4
230.0				41547.56	326.148	3.1
240.0				45238.93	355.126	2.8
250.0				49087.39	385.336	2.6
260.0	-	-	+2.0 -4.0	53092.92	416.779	2.4
270.0				57255.53	449.456	2.2

Note:

The above cross-section area and 1 m section weight have been calculated for nominal dimensions. For the purposes of calculations, 1 m of the rolled stock steel density has been taken as equal to 7.85 t/m³. The weight of 1 m of the rolled stock shall be a reference value.

If requested, round steel bars can be made under positive deviation values as specified in the table

Diameter, mm	Maximum Limit Threshold
From 5.0 to 9.0, inclusively	+0.5
From  9.0 to 19.0	+0.6
19.0 - 25.0	+0.8
25.0 - 31.0	+0.9
31.0 - 37.0	+1.1

The out-of-roundness parameter of the rolled stock shall not exceed 50% of the total threshold deviation per the diameter. It is permitted that the out-of-roundness parameter for the instrumental alloy-treated products and fast-cutting rolled stock the out-of-roundness may be within the limits of 60% of the total threshold deviation from the set diameter.

Rolled stock with the diameter up to 9 mm are manufactured in rolls, while for the diameter of more than 9 mm – in plain bars.

Subject to the client order, rolled products are manufactured for: indexing length, divisive indexing length, and random length.

Maximum threshold deviations of the rolled stock for both indexing and divisible indexing lengths shall not exceed:
+30 mm, if the length is up to 4 m, inclusively;
+50 mm, if the length varies from 4 m to 6 m, inclusively; and
+70 mm, if the length exceeds 6 m.

Plain bar bending shall not exceed the values specified in the table below.

Diameter	Bending Value
	Class I	Class II
Up to 25 mm, inclusively	0.5% of the length	-
More than 25 mm	0.4% of the length	0.5% of the length

The curvature of the rolled measured for the wavelength of the minimum of 1 m and at the minimum  distance of 1 m, providing that the distance to the ends shall be not less than 150 mm. The Diameter: the out-of-roundness parameter of the rolled stock shall be measured at the distance of not less than 150 mm from the end of the rod and at least 1.5 m away from the end of the coil when it is up to 250 kg, and at the minimum of 3.0 m, if its mass exceeds 250 kg.