• Full series martensitic stainless forged rings: 410, 420, 431, 440C, compliant with ASTM A182 F6 standard for pressure forgings
• Tunable high hardness & wear resistance via quenching + tempering heat treatment for all four grades
• All grades fully magnetic after heat treatment, low raw material cost vs nickel-bearing stainless steel
• 410: General-purpose low carbon martensite for light wear mechanical ring parts
• 420: Medium carbon grade balanced hardness & corrosion for cutlery & mold forgings
• 431: Nickel-alloyed martensite with improved toughness & moderate corrosion resistance
• 440C Ultra-high carbon molybdenum grade, maximum hardness HRC58–62 for heavy wear bearing blanks
• Continuous uniform grain flow via radial ring rolling, stable annular mechanical performance
• Custom OD, ID, height & full CNC turning, boring, grooving per customer CAD/PDF drawings

This series martensitic stainless steel forged rings are produced via open-die forging and seamless radial ring rolling process. All martensite grades are supplied in full annealed soft state for easy CNC machining; customers can perform custom quenching & tempering to target hardness levels.

No expensive nickel element in base formula, greatly cutting procurement cost compared to 304/316L austenitic steel. Different carbon & nickel contents create tiered performance: low-carbon 410 for light-load equipment; medium-carbon 420 for tool & mold rings; nickel-containing 431 for high-toughness pressure parts; high-carbon molybdenum 440C for ultra-wear bearing and measuring fixture forgings. Seamless ring blank eliminates heavy deep boring of solid bar, widely machined into valve flanges, mold holder rings, bearing retainers and mechanical sealing annular components for machinery, mold, hydraulic and hardware industries.

Basic 13% chromium low-carbon martensite. Soft after annealing, good machinability; moderate hardness after quenching, suitable for general valve, pump and low-load mechanical ring forgings with dry atmospheric service.

Medium chromium & medium carbon martensite. Higher hardening capacity than 410; balanced wear & mild anti-rust performance, ideal kitchen hardware, mold and medical equipment annular parts.

Nickel-modified martensitic stainless steel. Extra nickel boosts toughness and anti-corrosion capacity, avoids brittle failure under cyclic load for high-strength hydraulic & pressure vessel rings.

Highest carbon martensite with molybdenum additive. Reaches extreme hardness after quenching, outstanding abrasion resistance; premium blank for precision bearings, gauges and heavy wear mold rings.

• Martensitic Stainless Steel: 410,420,431,440A,440B,440C,416 free machining grade
• Ferritic Stainless Steel: 409,430,439,444
• Austenitic Stainless Steel: 304,316L,321,347,904L
• Duplex Stainless Steel: 2205,2507,S32750,F51,F55
• PH Stainless Steel:17-4PH,15-5PH,17-7PH
• Nickel Alloys: Monel400/K500, Incoloy825, Inconel600/625, Hastelloy C276
• Alloy & Carbon Steel:4140,4340,F22,F91,A105,A516 Gr.70

1. Cost-Effective Nickel-Free Formula

   No nickel alloy element, raw material price far lower than austenitic stainless steel for dry & weak corrosive environments.

2. Adjustable Hardness Via Quench & Temper

   All martensite grades can be hardened after machining; 440C reaches HRC58–62 for extreme wear service.

3. Full Magnetic Property

   Magnetic in all heat treatment states, perfect for magnetic mechanical assembly ring components.

4. Tiered Grade Selection For Diverse Demands

   410 general use, 420 tool steel, 431 high-toughness, 440C ultra-wear, one-stop grade matching.

5. Continuous Forged Grain Flow

   Uninterrupted metal fiber from ring rolling improves fatigue resistance under cyclic load & pressure.

• 410: Valve flange rings, pump housing annular parts, low-load mechanical support forgings
• 420: Mold holder rings, kitchen equipment flanges, medical instrument ring blanks
• 431: High-pressure hydraulic valve rings, heavy-duty machinery sealing forgings
• 440C: Precision bearing retainer rings, measuring tool blanks, high-wear mold rings
• General: Gear housing rings, shaft lock collars, hydraulic cylinder end flanges

We provide integrated open-die forging & seamless ring rolling production, full CNC precision machining per customer CAD/PDF drawings:

• Rough cutting, facing, inner & outer diameter turning, ring height milling
• Precision boring, grooving, drilling, threading, chamfering & polishing
• Custom full annealing / quenching + temper heat treatment options
• Surface pickling, passivation finishing treatment

We supply martensitic forged rings for mold, hydraulic, machinery and hardware global industrial clients.

• 100% UT Ultrasonic Testing to detect forging lamination & internal crack defects
• Full batch tensile, yield & hardness mechanical performance inspection
• High-precision caliper & CMM for OD/ID/height tolerance control
• Spectrometer full spectrum chemical composition analysis per heat lot
• Metallographic martensite microstructure observation after heat treatment

Mill Test Certificate EN 10204 3.1 can be issued and delivered together with shipment documents before delivery.

• Inner layer: Waterproof anti-rust plastic full wrap + separate plastic protective sleeves
• Outer layer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision deformation
• Custom heavy-duty export packaging available upon customer request

Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on ring OD/ID size, height, order quantity and custom heat treatment demands.