GBQ, CrMoV, 416R, 4140R, 4150Radmin2020-09-25T11:46:50-04:00

Specialty Steels: GBQ, CrMoV, 416R, 4140R, 4150R

Summit Steel brings its same high quality services and solutions to firearms manufacturers, offering the following grades: GBQ steel. Gun barrel quality steel. Chrome Moly steel. SBQ-AQ-BQ-GBQ | MIL-B-11595E (AR)

For a Mil-Spec barrel steel; the specification would be listed as MIL-B-11595E. This is to say that not all 4150 steels are considered Mil-Spec. In order for it to be Mil-Spec it would need to be a 4150 grade AND it would have to comply with the specifications listed in 11595.

An 11595 barrel steel (Mil-Spec) gets its additional strengthening properties over the common commercial 4140 by one of two ways;
more carbon in the steel
-or –
more carbon with the addition of Vanadium.

SOURCE: AR15-Forum

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"Summit took the initiative with their stocking program so we have material when we need it,” says the purchasing agent for a manufacturer of components for high-performance vehicles. Now, Summit supplies about 80 percent of the manufacturer’s bar material, which includes 4140 alloy and 4150 alloy bearing quality steel, as well as 8620 bearing steel. “Their program makes my job easier. I never have to worry about stock.”

Raising the Bar, Modern Metals 2013

“I think in manufacturing you have to continuously work on cost reduction ideas while improving production methods,” [one] North American plant manager says. “I believe Summit is on board with that. Summit has been quick to resolve any quality issues and that’s what you expect as a customer. Our customers expect the same from us.”

Selling Good Service, Modern Metals 2011

“Summit Steel’s pricing is pretty reasonable,” [one] fabrication supervisor adds. “Right now, customer service stands out as we look at other [products] we need to make in the future.” He notes that because of the successful coupling in the past, this North American company is likely to work with Summit Steel on future endeavors. “We have a contact person who looks after us—he emails me with updates”.

Selling Good Service, Modern Metals 2011