ASTM A179 vs A192 vs A214: which carbon steel tube?

Side-by-side comparison

	ASTM A179	ASTM A192	ASTM A214
Manufacture	Seamless, cold drawn	Seamless, hot finished or cold drawn	Electric-resistance welded
Written for	Heat exchangers, condensers	High-pressure boilers	Heat exchangers, condensers
OD range	1/8″ to 3″	1/2″ to 7″	Up to 3″
Maximum hardness	72 HRB	77 HRB	72 HRB
ASME equivalent	SA179	SA192	SA214

When to specify each

A179 is the default for shell-and-tube heat exchangers, feedwater heaters and condensers where the duty does not call for stainless or titanium. The seamless, cold-drawn tube has a smooth bore and close tolerance and rolls cleanly into tube sheets, which is why it dominates exchanger retubes.

A192 is specified for boiler tubes and superheaters operating at high pressure, and covers larger diameters than A179.

A214 is a welded alternative to A179 for exchanger and condenser service. It can cost less, but many plant owners and design codes require seamless tube for critical exchangers, so check the datasheet before substituting.

Buying carbon steel tube in South Africa

ASTM A179 is Stage Metals’ most-ordered product, made to order direct from CSM Group and delivered to your door anywhere in South Africa. If your datasheet calls for A192 or A214, send it to us and we will confirm what we can supply. See where to buy A179 tube in South Africa and the full A179 specification.

Common questions

Can A192 replace A179 in a heat exchanger?

Sometimes, but the hardness limit is higher (77 HRB against 72 HRB), which can affect how well the tube rolls into the tube sheet. Always confirm with the exchanger designer before substituting.

Is welded A214 tube as good as seamless A179?

A214 is suitable for many exchanger duties, but seamless A179 avoids a weld seam and is usually preferred for critical service or where the specification requires seamless tube.