ASTM A276, AMS 5618, AISI 440C Stainless Steel Bar

ASTM A276, AMS 5618, AISI 440C, SAE 51440C Stainless Steel Bar/Rod

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AISI 440C (UNS S44004, ASTM A276-98b, JIS SUS440C)stainless steel is a high carbon and high chromium martensitic stainless steel with a carbon content of 1.0% and a chromium content of 17%.

AISI 440C stainless steel is mainly used to manufacture bearing parts that work in corrosive environments and nonlubricated strong oxidizing atmospheres.

AISI 440C has good high-temperature dimensional stability, so it can also be used as a corrosion-resistant high-temperature bearing steel. In addition, it can also be used to manufacture high-quality knives, such as medical surgical knives, scissors, nozzles, bearings, etc.

The ability of 440C to withstand dynamic loads is relatively low.

AISI 440C has good welding performance, making it more adaptable in the connection process of structural components such as pipelines and pressure vessels.

AISI 440C has good stress relaxation resistance and can maintain stable mechanical properties and dimensional stability under long-term stress.

Mechanical properties of 440C: tensile strength of 800 MPa, yield strength of 550 MPa, and elongation of 25%.

AISI 440C has good friction resistance in high-temperature environments and is suitable for manufacturing components under high-temperature friction conditions.

ASTM A276, AMS 5618, AISI 440C Stainless Steel Bar

Standard Specifications

  1. ASTM A276, A314, A484, A473, A493, A580

  2. AMS 5618, 5630, 5880

  3. MIL SPEC MIL-S-862

  4. FEDERAL QQ-S-763

  5. ASME SA276

  6. UNS S44004

  7. SAE J405 (51440C)

  8. SAE 51440C

  9. DIN 1.4125

Equivalent grades

SAEASTMJISNFDINUNSGBAISIIOSGOSTEN
51440C A276-98bSUS440CZ100CD17X105CrMo17(1.4125 )S4400411Cr17440CA-1695Ch181.4125

Chemical composition

GradeCSiNiSMnPCrFe
440Cmin.0.95-----16.00-
max.1.201.00-0.0301.000.04018.00-

Mechanical Properties

GradeTensile Strength (MPa) minElongation (% in 50mm) minYield Strength 0.2% Proof (MPa) minHardness
Rockwell B (HR B) maxBrinell (HB) max
440C75814448269-

Application

Injection molds, cutting tools, surgical tools, custom knives, food processing equipment, bearings, petroleum pumps and valves.

Heat Treatment

  1. Warmup: 1400/1500F (760/815C) is the conventional warmup stage; for imbalanced geometries or complex designs, the optional preheat step is 1100/1250F (590/675C), equalized.

  2. Austenitizing: Equilibration at 1850/1900F (1010/1020C) for 30 to 45 minutes at room temperature.

  3. Quenching: Air, positive vacuum, at least 2 bar, to 125F (50C). Stop the supply of oil below 1000F (540C). Air cooled to 65°C/150°F. Temper right away.

  4. Temperature: air-cooled for two hours at 400/800F (205/425C). Exercise twice. Tempering should be avoided between 800 and 1100°F since it lowers corrosion resistance and hardness.

  5. Cryogenic therapy: By changing retained austenite, freezing treatment can enhance long-term dimensional stability. Tempering must occur after the freezing procedure, which is often performed after the initial tempering.

Welding

Use stainless steel filler material made of 420 or 440C. Annealed Substance: While welding, keep the temperature above 600F (320C) and preheat to 600/800F (320/430C). After welding, reanneal or temper at 1200/1400F (650/760C) for four hours.

Preheat the hardened material to a minimum of 400F (205C), or 50F (30C) below the original tempering temperature. When welding, keep the temperature above 400F (205C). After welding, cool to 150F, or 65C. Temper right away at a temperature that is 25F (15C) lower than the original. 400F minimum (205C)

Stainless Steel Grade List In Different Countries

NoChinaJapanAmericaKoreaEUIndiaAustraliaTaiwan
GBJISASTMUNSKSBS ENISASCNS
112Cr17Mn6Ni5NSUS201201S20100STS2011.437210Cr17Mn6Ni4N20201-2201
212Cr18Mn9Ni5NSUS202202S20200STS2021.4373
202
312Cr17Ni7SUS301301S30100STS3011.431910Cr17Ni7301301
4
SUS302302S30200STS3021.43302
5
SUS303303S30300STS3031.4305
606Cr19Ni10SUS304304S30400STS3041.430107Cr18Ni9304304
7
SUS304S304SS31008
1.4845
304S304S
8022Cr19Ni10SUS304L304LS30403STS304L1.430602Cr18Ni11304L304L
906Cr19Ni10NSUS304N1304NS30451STS304N11.4315304N1304N1
1006Cr19Ni9NbNSUS304N2XM21S30452STS304N2304N2304N2
11022Cr19Ni10NSUS304LN304LNS30453STS304LN304LN304LN
1210Cr18Ni12SUS305305S30500STS3051.4303305305
13
SUS308308S30800



1406Cr23Ni13SUS309S309SS30908STS309S1.4833309S309S
15
SUS309309S30900STS3091.4828
16
SUS310310S31000
1.4841
1706Cr25Ni20SUS310S310SS31008STS310S1.4845310S310S
1806Cr17Ni12Mo2SUS316316S31600STS3161.440104Cr17Ni12Mo2316316
1906Cr17Ni12Mo2TiSUS316Ti316TiS316351.457104Cr17Ni12MoTi20316Ti316Ti
20022Cr17Ni12Mo2SUS316L316LS31603STS316L1.4404~02Cr17Ni12Mo2316L316L
2106Cr17Ni12Mo2NSUS316N316NS31651STS316N316N316N
22022Cr17Ni13Mo2NSUS316LN316LNS31653STS316LN1.4429316LN316LN
2306Cr18Ni12Mo2Cu2SUS316J1STS316J1316J1316J1
24022Cr18Ni14Mo2Cu2SUS316J1LSTS316J1L316J1L
2506Cr19Ni13Mo3SUS317317S31700STS317317317
26022Cr19Ni13Mo3SUS317L317LS31703STS317L1.4438317L317L
27
SUS321H321H





2806Cr18Ni11TiSUS321321S32100STS3211.454104Cr18Ni10Ti20321321
29
SUS303Se303SeS30323STS303Se
3006Cr18Ni11NbSUS347347S34700STS3471.45504Cr18Ni10Nb40347347
31DP11SAF2304S323041.4362
32DP1S315001.4417
33DP8SAF2205S318031.4462
34329J2l
S6312601.4501
35UR47N+SAP2507S327501.441
36UR52N+SAP2507S325501.4507
37SUS329J1329S32900STS329J11.4477329J1329J1
38022Cr19Ni5Mo3Si2NSUS329J3LS31803STS329J3L1.4462329J3L329J3L
3906Crl3AlSUS405405S40500STS4051.400204Cr13405405
40022Cr11TiSUH409409S40900STS4091.4512409L409L
41SUS410L410LSTS410L
42SUS447J1447J1
43
XM27
44SUS410S410S
45
429
46022Cr12SUS410LSTS410L410L410L
4710Cr17SUS430430S43000STS4301.401605Cr17430430
48
SUS430F430FS43020STS430F1.4104430F430F
49

430L




5010Cr17MoSUS434434S43400STS4341.4113434434
51
SUS436L436L




52022Cr18NbTiS439401.4509439439
53019Cr19Mo2NbTiSUS444444S44400STS4441.4521444444
54446
5500Cr18Mo2Ti
5600Cr17Ti
5712Cr12SUS403403S40300STS403403403
5812Cr13SUS410410S41000STS4101.400612Cr13410410
59
SUS414414





60
SUS416416

1.4005


6120Cr13SUS420J1420S42000STS420J11.402120Cr13420420J1
6230Cr13SUS420J2STS420J21.402830 Cr13420J2420J2
63
SUS420F






6468Cr17SUS440A440AS44002STS440A440A440A
65
SUS440B440B





66
SUS440f440f





67
SUS440C440C





682Cr16Ni2SUS431431S431001.4057431431
69
SUS410J1410J1





70
SUS420J1429J1





71

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