GH3030 (Inconel 600) Thick-Wall Tube & Hollow Bar: OD x Wall x Length, Grades and RFQ

Quick answer: GH3030 is the Chinese GB grade for a solid-solution Ni–Cr high-temperature alloy, commercially the equivalent of Inconel 600 / UNS N06600. The stamped call-out on our stock — "GH3030 Φ228×9×260" and "Φ228×5×260" — reads outside diameter × wall × length in millimetres (228 mm OD, 9 mm or 5 mm wall, 260 mm long). As a thick-wall tube or hollow bar it is used where you need 600-series corrosion and oxidation resistance in a tubular shape: furnace and heat-treat hardware, thermowell and instrument tubing, and machined hollow components. Specify the grade (GH3030 or N06600), OD × wall × length, the standard (GB/T 15062 / ASTM B167 / B516) and condition.

What GH3030 is (and how it maps to Inconel 600)

GH3030 (also written GH30) is a Chinese nickel–chromium superalloy; in Western specs the matching material is Inconel 600 / UNS N06600. Both are solid-solution strengthened Ni–Cr alloys — no precipitation hardening — chosen for high-temperature oxidation and general corrosion rather than peak strength.

Always confirm the exact chemistry against the spec on the mill test certificate, because GB and ASTM limits differ slightly.

Reading the mark "Φ228×9×260"

That three-number format (OD × wall × length) is the tube/hollow-bar call-out. Compare a solid bar, which would be marked diameter × length only — the extra middle number tells you it is a hollow section.

Thick-wall tube vs hollow bar — which are these?

Both share the same chemistry; the difference is whether you buy it as pressure tubing or as machining stock. The 228 mm OD / 5–9 mm wall sections in the photo are short cut lengths — typical of either offcut tubing or hollow-bar blanks headed for the machine shop.

Why choose GH3030 / 600 in tubular form

• High-temperature oxidation — service to roughly 1000–1150 °C in air, with a stable Cr₂O₃ scale.
• General corrosion — resists many acids and caustic; good in steam and high-purity water.
• No post-weld heat treatment needed for corrosion in most services.
• Tubular geometry — thermowells, heaters, instrument and sample lines where a solid bar will not do.

If your priority is seawater or high strength rather than pure heat, see Inconel 625 or Monel 400 sheet; if it is straight high heat, Inconel 601 bar runs hotter.

Mechanical properties (annealed, N06600 reference)

Like 601, 600 is solid-solution strengthened — there is no age-hardening step to specify.

GH3030 / 600 tube & hollow-bar RFQ checklist

1. Grade: GH3030 (GB) or Inconel 600 / UNS N06600.
2. Geometry: OD × wall × length (mm), and whether tube or hollow bar.
3. Standard: GB/T 15062, ASTM B167 (seamless tube), B516 (cold-drawn), or B512 (hollow bar).
4. Condition: annealed, bright-annealed, or pickled.
5. Quantity, cut length, and any UT or hydrostatic test.
6. Plan weight with the alloy weight calculator.

FAQ

Q: Is GH3030 the same as Inconel 600? A: Commercially yes — GH3030 is the Chinese GB grade and Inconel 600 / UNS N06600 is the Western equivalent. Chemistry overlaps closely; confirm limits on the cert because GB and ASTM differ in a few maxima.

Q: What does "Φ228×9×260" mean? A: Outside diameter 228 mm, wall thickness 9 mm, length 260 mm. The middle number being a wall tells you it is a hollow section, not a solid bar.

Q: Tube or hollow bar — which should I buy? A: Buy seamless tube for pressure/instrument service to a tube standard; buy hollow bar when you will machine the OD/ID yourself into a sleeve or bushing.

Q: Does 600 need heat treatment after welding? A: For corrosion and oxidation service, no post-weld heat treatment is required; stress relief is optional for dimensional stability.

Q: How heavy is a 228×9×260 section? A: Annulus volume (π/4·(0.228²−0.210²)·0.260 m³ ≈ 0.00178 m³) × density ~8.4 g/cm³ ≈ 15 kg per piece — check the weight calculator for your exact size.