Maraging C350 — The Highest-Strength Grade in the Maraging Steel Family, Trading Toughness for Maximum Tensile Capacity
Shivam Forge manufactures forgings in Maraging C350 — the highest-strength commercially available maraging steel grade, reaching approximately 2400 MPa tensile strength through age-hardening heat treatment, specified for rocket motor casings, high-performance fasteners, and weight-critical aerospace components where maximum strength-to-weight ratio outweighs the toughness margin lower-strength maraging grades preserve. Full solution treatment and ageing, EN 10204 3.1/3.2 certification. Rajkot, India. Call +91-9265772827.
Maraging steel is supplied across a family of grades distinguished primarily by cobalt and titanium content, which determines the volume of intermetallic strengthening precipitate the age-hardening (maraging) heat treatment develops and, correspondingly, the ultimate strength level the grade reaches — and C350 sits at the top of this strength curve, delivering approximately 2400 MPa tensile strength compared to the roughly 2050 MPa a mid-range grade like C300 typically achieves. This additional strength doesn't come free: maraging steel's strength-toughness relationship follows the same general pattern found across virtually all high-strength alloy systems, where pushing tensile capacity higher through greater precipitate volume fraction correspondingly reduces fracture toughness and impact resistance, meaning C350 trades a meaningful measure of the toughness margin that makes lower-strength maraging grades attractive for fracture-critical applications in exchange for maximum achievable strength-to-weight ratio. This trade-off makes C350 the correct specification specifically for applications where component weight reduction at the absolute highest achievable strength is the dominant design driver and the design's fracture toughness margin has been engineered with C350's specific (lower, relative to C300) toughness properties explicitly accounted for — rocket motor casings and certain high-performance fastener and structural applications being the classic examples — rather than a universal upgrade over lower-strength maraging grades for any application where 'stronger is better' might seem like an adequate selection logic.
Maraging C350 forgings for solid rocket motor casing applications where maximum strength-to-weight ratio directly improves rocket performance and the design's toughness margin has been engineered specifically around C350's property profile.
Maraging C350 forgings for high-performance fastener and threaded component applications requiring maximum tensile capacity in a compact section size, common in aerospace and motorsport structural connections.
Maraging C350 forgings for aerospace structural components where component weight reduction at maximum achievable strength is the dominant design driver, justifying the reduced toughness margin relative to C300.
Maraging C350 forgings for precision tooling applications requiring maximum achievable hardness and wear resistance alongside the dimensional stability maraging steel's low-distortion heat treatment provides.
Full solution treatment followed by precise age-hardening heat treatment developing C350's maximum strength condition through cobalt-titanium intermetallic precipitation, with tighter process control than lower-strength grades typically require given the reduced toughness margin at this strength level.
Fracture toughness testing verifying C350's toughness properties meet the specific application's design requirement, given the reduced toughness margin this highest-strength grade carries relative to C250 or C300.
Tensile, hardness, and toughness testing confirming the heat-treated forging achieves C350's characteristic maximum strength condition, with full documentation of the achieved property combination.
Material test certificates per EN 10204 3.1 as standard, with 3.2 third-party witnessed certification available for aerospace and other regulated application documentation requirements.
Maraging steel is supplied across a family of grades — commonly identified as C200, C250, C300, and C350 — distinguished primarily by cobalt and titanium alloying content, which governs the volume of intermetallic strengthening precipitate the characteristic age-hardening (maraging) heat treatment develops within the material's low-carbon nickel-cobalt-molybdenum matrix. Higher cobalt and titanium content produces a correspondingly greater precipitate volume fraction and higher resulting tensile strength, and C350 sits at the top of this progression, reaching approximately 2400 MPa tensile strength — a genuinely exceptional strength level even within a material family already known for delivering among the highest strength of any commercially forgeable steel.
This maximum strength position within the maraging family doesn't come without cost, and understanding that cost matters directly to correct grade selection: the same general strength-toughness trade-off pattern observed across essentially all high-strength alloy systems applies within the maraging family as well, meaning C350's greater precipitate volume fraction, while delivering its higher tensile strength, correspondingly reduces the material's fracture toughness and impact resistance compared to lower-strength grades like C300 or C250. A component design that would tolerate C300's toughness margin comfortably might not tolerate C350's reduced margin without additional design consideration — meaning the decision to specify C350 over a lower-strength maraging grade needs to be a deliberate engineering choice made with the toughness trade-off explicitly understood, not simply a default assumption that the highest-strength available grade represents the best choice.
The applications where C350 genuinely earns its position — rocket motor casings, high-performance fasteners, and certain weight-critical aerospace structural components — share a common characteristic: these are contexts where component weight reduction at maximum achievable strength delivers outsized value relative to the toughness margin sacrificed to reach that strength, and where the detailed structural design has been engineered specifically around C350's known, characterized toughness properties rather than assuming a generic maraging steel toughness level. This is precisely the same design discipline that governs any high-strength material selection at the top of its family's strength range: the strength gain is real and valuable, but only when the corresponding toughness reduction has been explicitly accounted for in the structural design rather than treated as an afterthought.
For aerospace, rocket propulsion, and high-performance fastener manufacturers requiring the maximum strength-to-weight ratio Maraging C350 delivers, Shivam Forge provides full solution treatment and age-hardening heat treatment with fracture toughness verification available. Contact our engineering team at +91-9265772827 or sales@shivamforge.com with your drawing and strength specification for a manufacturability review and quotation.
C350 has higher cobalt and titanium content than C300, which develops a greater volume of intermetallic strengthening precipitate during age-hardening, reaching approximately 2400 MPa tensile strength compared to C300's roughly 2050 MPa. This additional strength comes with a corresponding reduction in fracture toughness and impact resistance compared to C300, following the same strength-toughness trade-off pattern found across most high-strength alloy systems.
C350 is the correct specification when component weight reduction at the absolute maximum achievable strength is the dominant design driver, and the design's fracture toughness requirement has been specifically engineered around C350's (lower, relative to C300 or C250) toughness properties. For applications where fracture toughness margin matters more than squeezing out the last increment of tensile strength, C300 or C250 are typically the more appropriate specification.
Yes. Maximum strength-to-weight ratio directly improves rocket performance, making C350's top-of-family strength level attractive for motor casing applications where the design has explicitly accounted for C350's specific toughness profile at the detailed design stage.
Solution treatment followed by precise age-hardening (maraging) heat treatment, similar in sequence to other maraging grades but requiring tighter process control given the reduced toughness margin at C350's maximum strength level — process deviation carries more consequence at this strength level than at lower-strength grades.
Yes. Fracture toughness testing is available, verifying C350's toughness properties meet your specific application's design requirement — an important verification step given this grade's reduced toughness margin relative to lower-strength maraging grades.
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.
