Questions & Answers
Low-alloy steels: 10G2, 17G1S, 09G2S.
Structural steels: 20, 35, 25, 15, 10.
Carbon steels: St45, St20, St35, St25, St10.
GOST Standards:
GOST 9.303-84 — Coating Requirements;
GOST 9.302-88 — Coating Control;
GOST 9.301-86 — Metallic Coatings;
GOST 9.307-89 — Hot-Dip Galvanizing;
GOST 17378-2001 — Seamless Steel Transitions;
GOST 30753-2001 — Welded Sector-Shaped Parts;
GOST 17380-2001 — Pipeline Parts.
International Standards:
ISO 14713 — Corrosion Protection;
ISO 1461 — Hot-Dip Galvanizing;
ISO 7005-1 — Flanged Joints;
ISO 5251 — Welded Fittings;
ISO 3419 — Steel fittings.
European standards:
EN ISO 14713 — Zinc protection against corrosion;
EN 10240 — Protective coatings for fittings and pipes;
EN ISO 1461 — Hot-dip galvanizing;
EN 10253-4 — Alloy steels;
EN 10253-2 — Pressure fittings.
For concentric transitions
| DN larger → smaller | Weight, kg |
| 50×40 | 0.35 |
| 50×32 | 0.4 |
| 65×50 | 0.55 |
| 80×65 | 0.8 |
| 100×80 | 1.2 |
| 125×100 | 1.8 |
| 150×125 | 2.6 |
| 200×150 | 4.5 |
| 250×200 | 7.8 |
| 300×250 | 11.5 |
| 400×300 | 20 |
For eccentric transitions
| DN larger → smaller | Weight, kg |
| 50×40 | 0.4 |
| 65×50 | 0.6 |
| 80×65 | 0.85 |
| 100×80 | 1.3 |
| 125×100 | 1.95 |
| 150×125 | 2.85 |
| 200×150 | 4.9 |
| 250×200 | 8.5 |
| 300×250 | 12.8 |
| 400×300 | 22.5 |