8630MOD Steel Bar
AISI 8630 Alloy Steel (Forged Bar Material)
Cromdane Steel, Inc. distributes quality AISI 8630 alloy steel forged bars and forgings. Our on-hand inventory is managed by our ISO Certified quality management system and is available for immediate saw cut.
We meet stringent customer specifications with short lead times and quick turnarounds. See our full alloy steel options including 8630MOD for high-performance forged and machined components.
8630 Forged Bar Characteristics
AISI 8630 MOD NQT 18/22 is a low alloy steel that is used in Hangers, Blow out preventers, as well as other well head equipment. In general 8630 MOD NQT 18/22 is stocked to 85KSI minimum yield and hardness at 22 HRC max for Nace compliance. 8630 MOD NQT 18/22 is an upgrade over 4130 because of It maintains good tensile and impact properties deep in to the product.
The 8630MOD alloy steel is ideal for forged bars and open die forgings requiring enhanced strength and toughness.
Call us today at 713-896-8295 to purchase 8630 alloy steel forged bar or forgings.
Contact a Specialized AISI 8630 Alloy Steel Expert Today
The following is an overview of our primary inventory, in-house available for immediate saw cut/delivery. We have steel arriving on regular intervals, so if you do not see what you need, give us a call and let us help you meet your manufacturing/delivery needs.
What Makes 8630 MOD Alloy Steel a Reliable Choice
AISI 8630 MOD contains carbon, manganese, chromium, nickel and molybdenum in proportions that give the alloy a dependable balance of strength and toughness. The nickel content supports impact resistance at lower temperatures, while chromium and molybdenum contribute to hardenability and wear resistance. These properties make 8630 MOD a practical choice for hangers, blowout preventers and other wellhead equipment that face cyclic loading or harsh field conditions.
What sets 8630 MOD apart for oil and gas applications is its controlled heat treatment condition. The grade is stocked to a minimum yield strength of 85 KSI with hardness maintained at 22 HRC max, which is the threshold required for NACE compliance. That hardness ceiling directly limits susceptibility to sulfide stress cracking in hydrogen sulfide environments — a failure mode that ends equipment life fast in wellhead service. Procurement teams specifying 8630 MOD get a grade that arrives already qualified for sour service, with the chemistry, heat treatment and documentation to support it.
8630 MOD Alloy Steel Properties
AISI 8630 MOD contains roughly 0.28 to 0.33 percent carbon, along with chromium, molybdenum, and nickel additions that give the grade its working strength and toughness. Manganese in the 0.70 to 0.90 percent range improves hardenability, while controlled limits on phosphorus and sulfur keep the alloy clean and consistent during machining and welding. This chemistry produces an alloy with good through-hardenability that maintains tensile and impact properties deep into the product — the key advantage over grades like 4130 in thicker-section wellhead components.
Heat treatment shapes the final mechanical properties of 8630 MOD, and the NQT 18/22 condition defines how the grade is supplied: normalized, quenched and tempered to a hardness window of 18 to 22 HRC. That controlled range delivers a minimum yield strength of 85 KSI while keeping hardness at the 22 HRC max required for NACE compliance. 8630 MOD forged bar machines cleanly once heat-treated to this range, which keeps downstream processing costs predictable for shops working the material into finished components.
Applications for 8630 MOD Alloy Steel
8630 MOD alloy steel sees heavy use in oil and gas equipment, including hangers, blowout preventers and other wellhead components that require dependable strength under repeated loading. The same properties that make 8630 MOD reliable in wellhead applications — through-section toughness and controlled hardness — also suit it for gears, shafts and other rotating parts in heavy industrial machinery, where wear resistance and fatigue strength are as important as raw tensile strength.
Open die forgings in 8630 MOD give engineers a starting point for custom parts that get machined to final dimensions after heat treatment.
Bar stock is ideal for shops running standard production parts at volume. Whether your application calls for a forged blank or bar ready for machining, 8630 MOD delivers predictable performance backed by NACE-compliant chemistry, documented heat treatment and full material traceability on every order.
8630 MOD Steel Bar Supplier With Inventory on the Ground
Cromdane Steel maintains 8630 MOD forged bars in stock for immediate saw cut and delivery, which keeps projects moving without the wait that comes with mill-direct orders. We work as an 8630 MOD steel bar supplier to manufacturers, machine shops, and equipment builders who need consistent diameters and lengths on a repeatable basis. Every order ships with full material traceability and test reports, so your quality team has documentation in hand before parts hit the shop floor.
Beyond bar stock, we source 8630 MOD open die forgings to the exact size and shape your application requires. All incoming material is inspected and tested under our ISO 9001:2015-certified quality management system, which governs every order from receipt to final shipment. For a closer look at our broader forging capabilities, see our alloy steel forgings page and our forged alloy steel bar page.
Why Procurement Teams Choose Cromdane Steel
Cromdane Steel has supplied alloy steel bars and forgings since 1982, with a customer base concentrated in oil and gas, wellhead equipment, and other heavy industrial sectors where material failure is not an option. Our material comes from North American mills, and our quality management system meets standards recognized across the steel industry. We also offer machining and finishing services for customers who want a turnkey part rather than raw bar stock, which removes a vendor step from your supply chain. To see our other available grades, visit our forging materials page.
Get Your 8630 MOD Forged Bar Quote Today
Cromdane Steel ships 8630 MOD forged bars from in-house inventory, so your project stays on schedule without waiting on mill lead times. Our team confirms chemistry, heat treatment, and certification requirements before your order leaves our Houston facility, giving your quality department documentation they can trust. Call 713-896-8295 or submit a quote request now to see why we're a trusted 8630 MOD alloy steel supplier.
Frequently Asked Questions About 8630 MOD Forged Bar
Yes. 8630 MOD can be welded using standard fusion methods, though we recommend welding before final hardening and tempering whenever possible. Depending on section thickness and part geometry, preheat and post-weld heat treatment may be necessary to avoid cracking in the heat-affected zone. Talk with our team about your specific part design before welding so we can advise on the right sequence.
Our in-house inventory includes numerous diameters of 8630 MOD suited to wellhead and heavy industrial components, with additional sizes available through our mill and forge shop partners for larger or custom orders. Call 713-896-8295 with your size requirement, and we will confirm current stock or quote a forged-to-size order.
8630 MOD generally offers higher hardenability than 4130 due to its nickel content, which helps the alloy maintain tensile and impact properties deep into thicker sections. 4130 remains a strong option for parts with thinner cross sections or where weldability is a higher priority. We help customers weigh these tradeoffs against their part geometry and service conditions before recommending a grade.