{"id":3977,"date":"2026-09-15T23:57:01","date_gmt":"2026-09-15T20:57:01","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3977"},"modified":"2026-09-17T23:06:40","modified_gmt":"2026-09-17T20:06:40","slug":"hastelloy-b-3-hastelloy-c-276-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/hastelloy-b-3-hastelloy-c-276-difference\/","title":{"rendered":"What Is the Difference Between Hastelloy B-3 and Hastelloy C-276?"},"content":{"rendered":"

Hastelloy B-3<\/strong> and Hastelloy C-276<\/strong> are two different families under the same brand. If the choice between them is made wrongly the equipment can be lost within weeks \u2014 because one contains no chromium and the other does, and that makes a vital difference in oxidising environments.<\/p>\n

Chromium, or no chromium?<\/h3>\n

According to our datasheets, Hastelloy B-3 has nickel at min 65%<\/strong>, molybdenum at ~28.5%<\/strong> and chromium at max 1.5%<\/strong> \u2014 that is, practically none. In C-276 chromium is 14.5\u201316.5%<\/strong> and molybdenum 15\u201317%<\/strong>.<\/p>\n

Molybdenum provides superior protection in reducing environments (especially hydrochloric acid<\/strong> at every concentration and temperature). The very high molybdenum of B-3 makes it unique in that field; no chromium-bearing alloy gives the same performance.<\/p>\n

But the absence of chromium carries a price: B-3 corrodes rapidly in oxidising conditions<\/strong>. Even the presence of oxidising impurities such as iron(III) or copper(II) ions in the acid increases the corrosion rate dramatically. C-276, thanks to its chromium, behaves in a balanced way in both oxidising and reducing conditions.<\/p>\n

B-3 was developed to remedy the thermal stability problems of its predecessor B-2; it is far more resistant to phase transformation during welding and heat treatment.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nHastelloy B-3<\/th>\nHastelloy C-276<\/th>\n<\/tr>\n<\/thead>\n
Nickel (Ni)<\/td>\nmin 65%<\/td>\n51 \u2013 63.5%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n~28.5%<\/td>\n15 \u2013 17%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\nmax 1.5%<\/td>\n14.5 \u2013 16.5%<\/td>\n<\/tr>\n
Tungsten (W)<\/td>\n\u2014<\/td>\n3.0 \u2013 4.5%<\/td>\n<\/tr>\n
Iron (Fe)<\/td>\nmax 1.5%<\/td>\n4.0 \u2013 7.0%<\/td>\n<\/tr>\n
Cobalt (Co)<\/td>\nmax 3%<\/td>\nmax 2.5%<\/td>\n<\/tr>\n
Manganese (Mn)<\/td>\nmax 3%<\/td>\nmax 1.00%<\/td>\n<\/tr>\n
Carbon (C)<\/td>\nmax 0.01%<\/td>\nmax 0.01%<\/td>\n<\/tr>\n
Silicon (Si)<\/td>\nmax 0.1%<\/td>\nmax 0.08%<\/td>\n<\/tr>\n
Titanium (Ti)<\/td>\nmax 0.2%<\/td>\n\u2014<\/td>\n<\/tr>\n
Aluminium (Al)<\/td>\nmax 0.5%<\/td>\n\u2014<\/td>\n<\/tr>\n
UNS<\/td>\nN10675<\/td>\nN10276<\/td>\n<\/tr>\n
W.Nr (DIN\/EN)<\/td>\n2.4600<\/td>\n2.4819<\/td>\n<\/tr>\n
EN chemical symbol<\/td>\nNiMo29Cr<\/td>\nNiMo16Cr15W<\/td>\n<\/tr>\n
AMS<\/td>\n\u2014<\/td>\n5530 \u00b7 5750<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n

Which one, and when?<\/h3>\n

Hastelloy B-3 is required<\/strong> \u2014 hydrochloric acid at every concentration, sulphuric acid at boiling temperature, phosphoric acid, acetic and formic acid processes, hydrogen chloride production. Provided there is no oxidising agent in the environment<\/strong>.<\/p>\n

Hastelloy C-276 is required<\/strong> \u2014 acid environments containing oxidising impurities, chloride solutions, sulphur compounds, flue gas desulphurisation, waste treatment, pulp bleaching. If the conditions are not fully known, the safe choice is C-276.<\/p>\n

In practice the decision comes down to this question: is the acid pure, or does it contain oxidising ions?<\/strong> If it is purely reducing, B-3; otherwise, C-276.<\/p>\n

The other members of the family<\/h3>\n

For an intermediate solution resistant to both conditions there is Hastelloy C-2000<\/a>, and for predominantly oxidising environments Hastelloy C-22<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

Hastelloy B-3 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Hastelloy C-276 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Hastelloy B-3 contains no chromium and was developed for reducing acids; C-276 contains both chromium and molybdenum.<\/p>\n","protected":false},"author":1,"featured_media":3478,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3977","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between Hastelloy B-3 and Hastelloy C-276? - Defence Metal<\/title>\n<meta name=\"description\" content=\"Hastelloy B-3 contains no chromium and was developed for reducing acids; C-276 contains both chromium and molybdenum.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/hastelloy-b-3-hastelloy-c-276-difference\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the Difference Between Hastelloy B-3 and Hastelloy C-276? 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