GOST 10705 Welded Steel Tubes

Advantages and Disadvantages of Black Steel Pipes UNIASEN

GOST 10705

GOST 10705 is a Russian national standard that mainly deals with insulating materials used in electrical equipment and systems and their related test methods.

This standard ensures that electrical equipment is safe and reliable during use. It focuses on how well the electrical insulation performs in different environments.

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GOST 10705 Dimension

External Diameter	Thickness， mm
mm	1	1.2	1.4	1.5	1.6	1.8	2	2.2	2.5	2.8	3	3.2	3.5	3.8	4	4.5	5	5.5	6	7	8	9	10
10	●	●
10.2	●	●
12	●	●	●	●	●
13	●	●	●	●	●
14	●	●	●	●	●
15	●	●	●	●	●
16	●	●	●	●	●
17	●	●	●	●	●
18	●	●	●	●	●	●
19	●	●	●	●	●	●	●
20	●	●	●	●	●	●	●
21.3	●	●	●	●	●	●	●
22	●	●	●	●	●	●	●
23	●	●	●	●	●	●	●	●	●
24	●	●	●	●	●	●	●	●	●
25	●	●	●	●	●	●	●	●	●
26	●	●	●	●	●	●	●	●	●
27	●	●	●	●	●	●	●	●	●
28	●	●	●	●	●	●	●	●	●
30	●	●	●	●	●	●	●	●	●
32	●	●	●	●	●	●	●	●	●	●	●
33	●	●	●	●	●	●	●	●	●	●	●
33.7		●	●	●	●	●	●	●	●	●	●
35		●	●	●	●	●	●	●	●	●	●
36		●	●	●	●	●	●	●	●	●	●
38		●	●	●	●	●	●	●	●	●	●
40		●	●	●	●	●	●	●	●	●	●
42		●	●	●	●	●	●	●	●	●	●
44.5		●	●	●	●	●	●	●	●	●	●
45		●	●	●	●	●	●	●	●	●	●
48			●	●	●	●	●	●	●	●	●	●	●
48.3			●	●	●	●	●	●	●	●	●	●	●
51			●	●	●	●	●	●	●	●	●	●	●
53			●	●	●	●	●	●	●	●	●	●	●
54			●	●	●	●	●	●	●	●	●	●	●
57			●	●	●	●	●	●	●	●	●	●	●
60			●	●	●	●	●	●	●	●	●	●	●	●
68.5			●	●	●	●	●	●	●	●	●	●	●	●
70			●	●	●	●	●	●	●	●	●	●	●	●	●
73			●	●	●	●	●	●	●	●	●	●	●	●	●
76			●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
80					●	●	●	●	●	●	●	●	●	●	●	●	●	●
89					●	●	●	●	●	●	●	●	●	●	●	●	●	●
95							●		●			●					●
102						●	●	●	●	●	●	●	●	●	●	●	●	●
108						●	●	●	●	●	●	●	●	●	●	●	●	●
114						●	●	●	●	●	●	●	●	●	●	●	●	●
127						●	●	●	●	●	●	●	●	●	●	●	●	●
138						●	●	●	●	●	●	●	●	●	●	●	●	●
140						●	●	●	●	●	●	●	●	●	●	●	●	●
152						●	●	●	●	●	●	●	●	●	●	●	●	●
159						●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
168						●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
177.8						●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
180															●		●
193.7							●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
219									●	●	●	●	●	●	●	●	●	●	●	●	●	●
244.5											●	●	●	●	●	●	●	●	●	●	●	●
273											●		●	●	●	●	●	●	●	●	●	●
325															●	●	●	●	●	●	●	●
355.6															●	●	●	●	●	●	●	●	●
377															●	●	●	●	●	●	●	●	●
406.4															●	●	●	●	●	●	●	●	●
426															●	●	●	●	●	●	●	●	●
478																	●	●	●	●	●	●	●
530																	●	●	●	●	●	●	●

Steel Grade

GOST 10705 St1: The basic carbon steel grade under GOST 10705, used for electric welded pipe. It is strong, affordable and suitable for low stress applications such as general construction.
GOST 10705 St2: Slightly stronger than St1. Suitable for welded pipes that need to be more durable in daily structural use.
GOST 10705 St3: A popular carbon steel grade for GOST 10705 pipe. It balances strength and flexibility and is the first choice for construction and utility pipes.
GOST 10705 St4: This is the strongest carbon steel in the St series, suitable for heavy welded pipes, providing stable performance under moderate pressure or abrasion.
GOST 10705 St20-1: A higher quality carbon steel (St20 base steel), designed to provide reliable strength and durability in more demanding installations such as heating or industrial pipes.
GOST 10705 St20-2: Similar to St20-1, but tuned for stronger performance. This grade is suitable for welding pipes in more severe conditions.

GOST 10705 Chemical Requirement

Steel Grade	Element Mass Fraction, in percentage
	Carbon	Silicon	Manganese	Aluminium	Titanium	Chrome	Nitrogen	Calcium	Sulfur	Phosphorus
	Carbon	Silicon	Manganese	Aluminium	no more than
22 ГЮ	0.15 to 0.22	0.15 to 0.30	1.20 to 1.40	0.02 to 0.05	0.03	0.4	0.012	0.02	0.01	0.02

GOST 10705 Mechanical Requirement

Steel grade	Wall thickness, mm	Ultimate resistance σu, N/mm² (kgf/mm²)	Yield stress σy, N/mm² (kgf/mm²)	Specific elongation δ%, for external diameter of pipes D, mm
		Ultimate resistance σu, N/mm² (kgf/mm²)	Yield stress σy, N/mm² (kgf/mm²)	From 159 to 246	From 273 to 377	From 402 to 530
		Not less
08п, 08с, 08кн 10, 10нц, 10кн, Cr2кн	6 and below More than 6	314 (32)	196 (20)	18 15	20 15	20 16
Cr2цн, Cr2кн	6 and below More than 6	333 (34)	206 (21)	17 14	18 14	20 15
15, 15нц, 15кн, 20, 20нц, 20кн	6 and below More than 6	353 (36)	216 (22)	17 14	18 14	20 15
Cr3нц, Cr3нц, Cr3кн	6 and below More than 6	353 (36)	216 (22)	17 14	17 14	19 15
Cr4нц, Cr4нц, Cr4кн	6 and below More than 6	402 (41)	225 (23)	15 11	17 12	18 13