GB/T 699 Compliant Forgings — Chinese National Standard Carbon Structural Steel Grades for Drawings Migrating from China-Sourced Supply
Shivam Forge manufactures carbon structural steel forgings to GB/T 699 — the Chinese national standard covering quality carbon structural steel grades such as 45 steel, 40Cr-adjacent, and related medium-carbon grades — for customers whose drawings and component specifications were originally developed against Chinese-sourced supply and who are now qualifying an alternative manufacturing base without redrawing to a different national standard. Rajkot, India. Call +91-9265772827.
GB/T 699 organizes quality carbon structural steel grades by a straightforward two-digit numbering system that indicates approximate carbon content multiplied by 100 — grade '45' steel contains approximately 0.45% carbon, grade '20' approximately 0.20%, and so on through the series (08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, and higher). This convention is conceptually similar to how JIS S45C encodes 0.45% carbon in its designation, or how AISI 1045 encodes the same information in the 10XX carbon steel series — the underlying metallurgy across these three national systems for a given carbon percentage is broadly comparable, since plain carbon structural steel chemistry doesn't vary dramatically between national standards at equivalent carbon levels. What differs, and what matters for a manufacturer requalifying a component from Chinese to Indian supply, are the specific tolerance bands on residual elements (manganese, silicon, phosphorus, sulfur), the exact mechanical property test requirements and locations, and the standard's specific heat treatment condition designations. Grade 45 steel under GB/T 699, for instance, is a workhorse medium-carbon grade used extensively across Chinese machinery, automotive, and general engineering manufacturing for shafts, gears, and structural components — functionally comparable to JIS S45C or a 1045-equivalent grade, but carrying its own specific composition and property table that a manufacturer must match precisely, not approximate, if the customer's incoming inspection or downstream qualification explicitly references GB/T 699. For companies diversifying their supply base away from single-country sourcing without wanting to bear the cost and schedule risk of a full drawing standard conversion, being able to forge directly to the GB/T 699 grade already on the drawing is what makes an alternative supplier a genuine drop-in qualification rather than a redesign exercise.
Forged shaft and gear blank components in GB/T 699 grade 45 steel, the most commonly specified medium-carbon grade in this standard, functionally comparable to JIS S45C and 1045-equivalent chemistry for general machinery applications.
Forged components in GB/T 699's lower-carbon grades suited to carburizing and case hardening, where a tough, lower-carbon core combined with a hardened case is the required property combination.
Forged blanks in GB/T 699's higher-carbon grades for applications requiring greater hardness, wear resistance, or spring characteristics after appropriate heat treatment.
Forged components manufactured directly to the GB/T 699 grade already specified on an existing drawing, supporting customers qualifying an alternative supply base without a standard conversion or redesign cycle.
Melt chemistry controlled to GB/T 699's specific composition requirements for the ordered grade, including the residual element tolerance bands that distinguish the standard from superficially similar JIS or AISI equivalents.
Heat treatment performed to the specific condition GB/T 699 designates for the grade and application — normalized, quenched and tempered, or as otherwise specified — matching the property requirements the standard defines.
Tensile, yield, elongation, and hardness testing performed and reported against GB/T 699's specific requirements for the ordered grade, verifying the forging meets the standard rather than an approximate equivalent.
Material test certificates per EN 10204 3.1/3.2 documenting GB/T 699 compliance, with cross-reference guidance to comparable JIS, DIN, or AISI grades available where a customer's internal engineering team needs that mapping for reference.
Global manufacturing supply chains include a substantial volume of components originally specified and drawn against Chinese national standards, simply because a large share of world manufacturing has historically sourced from China, and GB/T 699 — the Chinese national standard for quality carbon structural steel — sits underneath a great many of those drawings for shafts, gears, and general medium-carbon structural components. When a company decides to diversify its supply base, whether for cost, risk, geopolitical, or lead-time reasons, the practical question isn't whether an alternative material of broadly similar carbon content can be sourced elsewhere — it almost always can — but whether the new supplier can manufacture and certify to the standard the drawing actually specifies, without triggering a costly and time-consuming engineering change and requalification cycle built around a different national standard.
GB/T 699's grade numbering follows an intuitive logic: the two-digit number approximates carbon content as a percentage times 100, so grade 45 steel runs approximately 0.45% carbon, grade 20 approximately 0.20%, and so on through a series spanning roughly 08 to 85. This is conceptually parallel to how JIS S45C or AISI's 10XX carbon steel series encode the same underlying information, and at a metallurgical level, plain carbon structural steels at matched carbon content across these national standards are genuinely similar materials. But 'similar' is not the same as 'identical,' and the specific tolerance bands on manganese, silicon, phosphorus, and sulfur, along with the standard's designated heat treatment conditions and mechanical property test requirements, differ enough between GB/T 699, JIS, DIN, and AISI equivalents that a customer's incoming inspection or downstream quality system referencing GB/T 699 specifically needs a supplier who can certify to that actual standard, not an approximated cross-reference.
This is the practical value of a forging manufacturer able to work directly against GB/T 699: it removes the engineering-change burden from the supply diversification decision. A component drawing that specifies GB/T 699 grade 45 steel, heat treated to a designated condition, with mechanical properties verified against that standard's specific requirements, can be sourced from an alternative manufacturing base while the drawing, the incoming inspection criteria, and the downstream qualification documentation all remain unchanged — the only thing that changes is where the forging is made. For engineering and procurement teams managing supply base diversification under time pressure, that stability in the specification itself is often as valuable as the alternative sourcing option.
For manufacturers and procurement teams sourcing carbon structural steel forgings to GB/T 699 as part of a supply base diversification effort, Shivam Forge manufactures and certifies directly to the standard's specific composition, heat treatment, and mechanical property requirements. Contact our engineering team at +91-9265772827 or sales@shivamforge.com with your drawing and grade requirement for a manufacturability review and quotation.
The grade number approximates the carbon content multiplied by 100 — grade 45 steel contains roughly 0.45% carbon. This is conceptually similar to how JIS S45C or AISI 1045 designations encode the same carbon percentage, though the specific composition tolerance bands, residual element limits, and property requirements differ between the three standards even at matched carbon content.
Yes. We can forge directly to the GB/T 699 grade specified on your existing drawing without requiring you to convert the specification to JIS, DIN, or ASTM equivalents. This is common for customers diversifying their supply base who want to requalify an alternative manufacturer without a redesign or standard-conversion cycle.
They're functionally comparable medium-carbon grades at approximately the same carbon content, but each standard has its own specific composition tolerance bands and property requirements. We forge and certify to whichever standard your drawing actually specifies rather than treating them as interchangeable without verification, since incoming inspection against the wrong standard's tolerance band can create a nonconformance even when the material is metallurgically very similar.
Yes, we can provide general grade cross-reference guidance for internal engineering reference. For any formal specification or customer-facing documentation, we always certify against the specific standard your drawing or purchase order calls out rather than substituting a cross-referenced equivalent standard.
We test and certify to GB/T 699's actual specified requirements for the ordered grade — composition, heat treatment condition, and mechanical properties — not an approximated JIS or ASTM equivalent. If your incoming inspection references GB/T 699 specifically, our documentation matches that reference.
Why Choose Shivam Forge
Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
