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Resources/Materials & grades/815M17 / EN353

Materials & grades

815M17 / EN353 / 17NiCrMo6-4 case-hardening steel

815M17 (formerly EN353) is a nickel-chromium-molybdenum case-hardening steel with 0.14–0.20% carbon, still ordered by its BS 970 name. Its European counterpart is 17NiCrMo6-4 (1.6566), and the Indian counterpart is 15Ni5Cr4Mo1.

Names by standard

What it is called in each region

RegionSystemDesignationNormaMatch
USAAISI/SAE4320Nearest SAE case-hardening Ni-Cr-Mo grade, but nickel is 1.65–2.00% against 1.20–1.50% for 17NiCrMo6-4, and chromium is 0.40–0.60% against 0.80–1.10%.SAE J404Closest equivalent
UKBS 970-3 (1991)815M17BS 970 alloy grades are superseded by EN 10084 but are still ordered by name.BS 970-3Same material
BS 970 (1955 EN series)EN353Superseded 1955 name, still the most-searched UK name. Its 1955 limits differ slightly from 815M17 in BS 970-3:1991; Roymech lists it as a 1.5% Ni/Cr/Mo steel.—Equivalent
EUEN 10027-1 name17NiCrMo6-4Total Materia lists it against 815M17 as an official equivalent.EN 10084Equivalent
EN 10027-2 number1.6566EN 10084Equivalent
EN 10027-1 name17NiCrMoS6-4Sulphur-controlled version of 17NiCrMo6-4 for machining.EN 10084Closest equivalent
ÍndiaIS 4432 / IS 157015Ni5Cr4Mo1Listed against 815M17 by Total Materia. Carbon is 0.12–0.18%, below the 815M17 range. Total Materia also lists the older Indian name 15NiCr1Mo12.IS 4432:1988; IS 1570 (Part 4):1988Closest equivalent
JapanJIS G 4053SNCM420Nearest JIS case-hardening steel but with more nickel (1.60–2.00%) and less chromium (0.40–0.60%) than 17NiCrMo6-4.JIS G 4053Closest equivalent

On equivalence

  • EN353 is the 1955 BS 970 name; 815M17 is its name in the later BS 970 system. Total Materia and Roymech map both to the same steel, and Total Materia lists 17NiCrMo6-4 (1.6566) as an official equivalent.
  • BS 970-3 limits were seen only in part (carbon 0.14–0.20%, chromium 0.80–1.20%). Check the full 815M17 limits before substituting 17NiCrMo6-4.
  • 815M17 is not 18CrNiMo7-6 or 822M17. 18CrNiMo7-6 has 1.50–1.80% chromium and 0.25–0.35% molybdenum. Roymech rates 815M17 at about 1.5% Ni/Cr/Mo and 822M17 (EN355) at about 2.0%.
  • India: IS 4432:1988 lists 15Ni5Cr4Mo1 with 0.12–0.18% carbon, so it sits below 815M17. IS 1570 (Part 4) also gives its core properties.
  • Japan: SNCM420 has 1.60–2.00% nickel and 0.40–0.60% chromium, against 1.20–1.50% and 0.80–1.10% for 17NiCrMo6-4. There is no close JIS match.
  • Phosphorus limit: Saarstahl prints ≤0.035% for 17NiCrMo6-4 while steeldata.info prints ≤0.025%. Confirm on the order.

Chemical composition

Composition limits, mass %

Element815M17UK · BS 970-3:1991 (partial, as shown by Total Materia)17NiCrMo6-4 (1.6566)EU · EN 10084 (as printed by Saarstahl)15Ni5Cr4Mo1Índia · IS 4432:1988SNCM420 (closest match)Japan · JIS G 4053 (as tabulated by Kobelco)
C0.14–0.200.14–0.200.12–0.180.17–0.23
Si—≤0.400.15–0.350.15–0.35
Mn—0.60–0.900.60–1.000.40–0.70
P—≤0.035≤0.035≤0.030
S—≤0.035≤0.035≤0.030
Cr0.80–1.200.80–1.100.75–1.250.40–0.60
Ni—1.20–1.501.00–1.501.60–2.00
Mo—0.15–0.250.08–0.150.15–0.30
Cu≤0.30———

Mechanical properties

Strength and hardness

ConditionTensile strengthYield strengthElongationHardness
Soft annealed (+A)Specified maximum hardnessEN 10084, 17NiCrMo6-4, via Saarstahl datasheet———≤229 HB
Treated to ferrite-pearlite structure and hardness range (+FP)Specified hardness rangeEN 10084, 17NiCrMo6-4, via Saarstahl datasheet———149–201 HB
Hardened and tempered at 200 °C, diameter ≤16 mmMinimum tensile strength, Saarstahl combined sheet for 17NiCrMo6-4 and related gradesSaarstahl datasheet, 17NiCrMo6-4≥1200 MPa≥174 ksi———
Hardened and tempered at 200 °C, diameter 16–40 mmMinimum tensile strength, Saarstahl combined sheet for 17NiCrMo6-4 and related gradesSaarstahl datasheet, 17NiCrMo6-4≥1000 MPa≥145 ksi———
Hardened and tempered at 200 °C, diameter 40–100 mmMinimum tensile strength, Saarstahl combined sheet for 17NiCrMo6-4 and related gradesSaarstahl datasheet, 17NiCrMo6-4≥900 MPa≥131 ksi———
Refined and quenched core, 15Ni5Cr4Mo1Specified core properties for the Indian grade; elongation on 5.65√A gauge length; Izod impact at least 41 JIS 1570 (Part 4):1988, Table 9≥990 MPa≥144 ksi—≥9 %—

In practice

Behaviour, heat treatment and uses

Characteristics

  • A 1.5% nickel-chromium-molybdenum case-hardening steel (Roymech): carburized to a hard case over a tough core.
  • 17NiCrMo6-4 has 0.14–0.20% carbon, 1.20–1.50% nickel, 0.80–1.10% chromium and 0.15–0.25% molybdenum.
  • Delivery conditions of 17NiCrMo6-4 (Saarstahl): soft annealed ≤229 HB, +FP 149–201 HB, +TH 179–229 HB, +S ≤255 HB.
  • Weldability was not covered by the sources read. Treat it as a carburizing steel that is welded, if at all, in the soft condition.

Heat treatment

  • 17NiCrMo6-4 (Saarstahl): forging or rolling 1100–850 °C; normalizing 830–870 °C; soft annealing 650–700 °C.
  • Carburizing 880–980 °C; core hardening 830–870 °C; intermediate annealing 650–700 °C; case hardening 780–820 °C; tempering 150–200 °C.
  • IS 4432 (15Ni5Cr4Mo1): carburize at 890–940 °C; direct or single hardening 810–840 °C; double hardening with the core at 840–880 °C and the case at 780–820 °C; quench in oil, thermal bath or polymer.

Usos típicos

  • Case-hardened transmission and machine parts ordered by the BS 970 name 815M17
  • Components needing a hard case and a core strength of about 1000 MPa or more (Saarstahl tensile minimums)

Alloy and case-hardening steels

Similar grades compared

GrauC %Mn %Cr %Ni %Tensile, first listed condition
815M17 / EN3530.14–0.200.60–0.900.80–1.201.20–1.50≥1200 MPa
16MnCr50.13–0.180.70–0.900.70–0.90≤0.25≥1000 MPa
18CrNiMo7-60.15–0.210.50–0.901.50–1.801.40–1.701180–1420 MPa
20MnCr50.17–0.220.70–0.900.70–0.90≤0.25≥1200 MPa
655M13 / EN36A0.08–0.130.45–0.651.00–1.403.00–3.50700–770 MPa
4320 / SNCM4200.17–0.220.45–0.650.40–0.601.65–2.00580 MPa
8620 / 20NiCrMo2-20.18–0.230.70–0.900.40–0.600.40–0.70530 MPa
93100.08–0.130.45–0.651.00–1.403.00–3.501289 MPa
4130 / 25CrMo40.28–0.330.40–0.600.80–1.10≤0.25590–760 MPa
4135 / 34CrMo40.33–0.380.70–0.900.80–1.10≤0.251000–1200 MPa

Composition from the US standard where one exists, otherwise the first standard listed on each grade's page. Strength conditions differ between grades; open a grade for its full table.

Perguntas respondidas

Common questions

What is EN353 equivalent to?

EN353 is the old name for the grade now ordered as 815M17; its 1955 limits differ slightly. The European equivalent is 17NiCrMo6-4 (1.6566). The nearest Indian grade is 15Ni5Cr4Mo1 (IS 4432) and the nearest Japanese grade is SNCM420, but both differ in composition.

Is 815M17 the same as 17NiCrMo6-4?

They are listed as equivalents. 17NiCrMo6-4 has 0.14–0.20% carbon, 1.20–1.50% nickel and 0.80–1.10% chromium. Check the full BS 970-3 limits against the EN 10084 limits before substituting.

Is EN353 a case-hardening steel?

Yes. EN353 and 815M17 are nickel-chromium-molybdenum case-hardening steels with 0.14–0.20% carbon. They are carburized and hardened to give a hard case over a tough core.

What is the difference between 815M17 and 18CrNiMo7-6?

18CrNiMo7-6 has more chromium (1.50–1.80%) and molybdenum (0.25–0.35%) than 17NiCrMo6-4, so it hardens deeper and is used for larger, more heavily loaded gears.

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Keep reading

4320 / SNCM420SAE 4320 is a nickel-chromium-molybdenum case-hardening steel with 0.17–0.22% carbon and 1.65–2.00% nickel, carburized to give a hard case over a tough core.18CrNiMo7-618CrNiMo7-6 (1.6587) is a chromium-nickel-molybdenum case-hardening steel with 0.15–0.21% carbon, used for heavily loaded gears and transmission parts.655M13 / EN36A655M13, formerly EN36A, is a UK case-hardening steel with about 3.25 % nickel and 0.8 % chromium, used for heavily loaded gears and shafts in large sections.8620 / 20NiCrMo2-28620 is a low-alloy nickel-chromium-molybdenum steel with about 0.20 % carbon, supplied for carburizing to give a hard case over a tough core in gears, shafts and pins.16MnCr516MnCr5 (1.7131) is a manganese-chromium case-hardening steel with 0.14–0.19 % carbon, used for gears, shafts and camshafts that are carburized and hardened.20MnCr520MnCr5 (1.7147) is a manganese-chromium case-hardening steel with 0.17–0.22 % carbon and a higher core strength than 16MnCr5, used for gears, shafts and cam parts.Quenching and temperingQuenching and tempering hardens steel by cooling it rapidly from the austenite range to form martensite, then reheats it below Ac1 to trade some hardness for toughness.BS 970 and the EN seriesBS 970 names steels with a six-character code such as 080M40, in which the first three digits give the steel type, the letter says how the steel is specified and the last two digits give the carbon content.EN 10027 names and numbersEuropean steels carry two identifiers under EN 10027: a steel name (Part 1) such as S235JR, C45 or 42CrMo4 that describes the steel's use or chemistry, and a material number (Part 2) such as 1.0503 or 1.7225.IS 1570 and Indian designationsIndian steel names follow the letter-symbol code in IS 1762 (Part 1), which the IS 1570 schedules use: 45C8 means about 0.45% carbon, C for carbon steel and about 0.8% manganese, while alloy names such as 40Cr4Mo3 list each element with a multiplied content figure.JIS steel designationsJapanese JIS steel symbols start with S for steel and add letters for the steel family or its use, but the number means different things in different standards.

References

Sources

  1. Saarstahl, Werkstoff-Datenblatt 17NiCrMo6-4 / 18NiCrMo6-4 / 17NiCrMoS6-4 / 20NiCrMoS6-4 — EN 10084 composition, delivery hardness, heat treatment and tensile minimums.
  2. IS 4432:1988 Case hardening steels (public copy) — Table 1 composition, Table 5 case-hardening temperatures.
  3. IS 1570 (Part 4):1988 Schedules for wrought steels, alloy steels (public copy) — Table 1 composition limits and the footnote cross-references to AISI and DIN grades.
  4. Kobelco: wire rod and bar specification tables (JIS G 4053 alloy steels for machine structure, revision of 20 Nov 2008; JIS G 4107 bolting steels) — JIS composition tables and the JIS-to-ISO/AISI cross-reference table.
  5. Total Materia, B.S. 815 M 17 — Partial BS 970-3 composition; equivalents EN353, 17NiCrMo6-4, 1.6566, IS 15Ni5Cr4Mo1.
  6. Roymech, sample BS 970 steels — 1955 EN numbers mapped to BS 970 names.

Values summarize published limits and typical data. The governing standard and the current edition control; check them before specifying.