ASTM A266 / ASME SA266 Gr.2N Forged Carbon Steel Gland Ring for Pressure Vessel
NACE ASME SA266 Gr.2N gland ring is a forged carbon steel ring machined from ASTM A266 / ASME SA266 Gr.2N forging stock, used to compress gland packing and to retain the sealing element in pressure vessels, heat exchangers, valves and pumps. It is a purpose-built pressure-associated forging supplied in the normalized condition, with hardness controlled to ≤ 22 HRC and full heat-number traceability, so the finished assembly can be released for wet H2S (sour) service under NACE MR0175 / ISO 15156.
The part is engineered for one job: to keep the seal tight at the joint where leakage is least affordable. Compared with a generic ring cut from plate, a forged and fully machined gland ring removes porosity and laminations in the load path, holds flatness and parallelism across the sealing faces, and carries a hardness profile that stays inside the sour-service window instead of drifting above it after welding or re-machining.
NACE here normally refers to NACE MR0175 / ISO 15156, the standard for materials used in sour oil and gas service containing H₂S.
For carbon steels, NACE/ISO 15156 generally requires:
-
Hardness control, commonly ≤22 HRC for carbon steel,
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Acceptable chemistry and heat treatment,
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Sufficient mechanical properties,
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Documented compliance and testing.
Chemical Composition % of ASME SA266 Gr.2N Gland Ring Carbon Steel Forgings
| Element |
Gr. 1 & 2 |
Gr. 3 |
Gr. 4 |
| C |
≤ 0.30 |
≤ 0.35 |
≤ 0.30 |
| Mn |
0.40~1.05 |
0.80~1.35 |
0.80~1.35 |
| P |
≤ 0.025 |
≤ 0.025 |
≤ 0.025 |
| S |
≤ 0.025 |
≤ 0.025 |
≤ 0.025 |
| Si |
0.15~0.35 |
0.15~0.35 |
0.15~0.35 |
Mechanical Property of ASME SA266 Gr.2N Gland Ring Carbon Steel Forgings
| Item |
Gr. 1 |
Gr. 2 & Gr. 4 |
Gr. 3 |
| Tensile Strength, min,ksi (MPa) |
60-85 (415-585) |
70-95 (485-655) |
75-100 (515-690) |
| Yield Strength (0.2% offset), min,ksi (MPa) |
30 (205) |
36 (250) |
37.5 (260) |
| Elongation in 2 in. or 50mm, min, % |
23 |
20 |
19 |
| Reduction of area, min, % |
38 |
33 |
30 |
Standards & Certifications
Manufacture follows the forging specification in the purchase order, with the inspection and documentation regime agreed at the enquiry stage. Certificates and approvals held for this product line include ASME II, ASME III, ABS, LR, DNV, GL, BV, CCS, KR, NK, TUV, PED, GOST, ISO and TS, and third-party witnessing (TUV, BV, LR, DNV, ABS, CCS and similar) can be arranged where a project demands it.
| Item |
Applied standard / document |
| Product specification |
ASTM A266 / ASME SA266, Grade 2 Normalized (Gr. 2N) |
| Design and construction codes served |
ASME Section VIII Div.1 / Div.2, ASME Section III, PED 2014/68/EU |
| Sour service qualification |
NACE MR0175 / ISO 15156, hardness and chemistry control |
| Material certificate |
EN 10204 3.1 mill test certificate, heat-number traceable |
| Non-destructive examination |
UT or MT on request, in accordance with the order specification |
| Quality system |
ISO 9001, with TUV / PED / GOST / TS approvals where applicable |
| Dimensional verification |
Per customer drawing, with report on request |
Application
Typical service positions for this gland ring include:
1. Pressure-vessel sealing and gland assemblies, including bolted cover and packing-box arrangements
2. Shell-and-tube and tubular heat exchangers, where the ring seats against the tube sheet or channel cover
3. Valve and piping components, including bonnet and stuffing-box retention
4. Pumps and mechanical sealing areas, where packing compression has to stay uniform around the shaft
5. Sour-service oil and gas equipment, when the finished part is certified to NACE MR0175 / ISO 15156
6. Boilers, steam turbines and large central air-conditioning equipment with comparable sealing duties
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