AT370444B - VALVE STEEL - Google Patents
VALVE STEELInfo
- Publication number
- AT370444B AT370444B AT0458181A AT458181A AT370444B AT 370444 B AT370444 B AT 370444B AT 0458181 A AT0458181 A AT 0458181A AT 458181 A AT458181 A AT 458181A AT 370444 B AT370444 B AT 370444B
- Authority
- AT
- Austria
- Prior art keywords
- valve steel
- steel
- hardness
- max
- forged
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
<Desc/Clms Page number 1>
Bei den derzeit gebräuchlichen Ventilstählen (s. etwa die Euronorm 90-71) kann zwischen solchen unterschieden werden, deren Chromgehalt im Bereiche von etwa 7 bis 12% liegt und höher legierten Sorten, deren Chromgehalt beträchtlich höher ist (insbesondere im Bereich von 17 bis 22% Cr) und die auch unterschiedlich hohe Anteile von Nickel aufweisen.
Die Erfindung befasst sich mit einer Verbesserung des erstgenannten Ventilstahl-Typs, weil bei dessen Verarbeitung bisher eine sehr aufwendige, aus einem Normalisieren (Normalglühen) der Schmiederohlinge bei etwa 1000 C, nachfolgendem Weichglühen bei etwa 800 C zur Vorbereitung der spanabhebenden Bearbeitung und Härten der Ventile aus etwa 10200C mit Anlassen bei 740 C bestehende Wärmebehandlung vorgenommen werden musste. Das Normalisieren ist erforderlich, um die beim Schmieden der Rohlinge auf Grund der Erhitzungsempfindlichkeit des Stahles eintretende Grobkörnigkeit des Gefüges zu vermindern bzw. weitgehend zu beseitigen.
Zielsetzung der Erfindung ist es, den durch die mehrmalige Wärmebehandlung bedingten Kosten- und Energieaufwand entbehrlich zu machen und die gewünschten Eigenschaftsverbesserungen
EMI1.1
0, 300, 15% Nb, ferner 0, 005 bis 0, 02% B und/oder 0, 002 bis 0, 1% Al, Rest Fe mit erschmelzungsbedingten Verunreinigungen enthält.
Im Vergleich zeigt der erfindungsgemässe Ventilstahl gegenüber dem nicht mikrolegierten Stahl wesentliche Vorteile. Offenbar durch die hohe Ausscheidungsfreudigkeit bedingt ist die Härte im naturharten Zustand, also die Härte des Schmiederohlings wesentlich niedriger (290 bis 320 HVs gegenüber 600 bis 640 HV,) mit der Konsequenz, dass nicht nur auf das Normalisieren sondern auch auf die Weichglühung und das Aufheizen auf die Härtetemperatur verzichtet werden kann. Die Schmiederohlinge können demnach unmittelbar der spanabhebenden Verarbeitung zugeführt und die Härteeinstellung kann allein durch Anlassen auf die erwähnte Anlasstemperatur vorgenommen werden. Die damit erzielten Vorteile liegen somit klar auf der Hand.
EMI1.2
härte von etwa 310 HVs auf.
Sie wurden sodann spanabhebend bearbeitet und schliesslich zweimal bei 7200C angelassen, wonach sie die angestrebte Härte von 300 HVs aufwiesen.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
In the currently used valve steels (see e.g. Euronorm 90-71), a distinction can be made between those with a chromium content in the range of around 7 to 12% and higher alloyed grades with a higher chromium content (especially in the range from 17 to 22) % Cr) and which also have different levels of nickel.
The invention is concerned with an improvement of the first-mentioned valve steel type, because in its processing so far a very complex one, from normalizing (normalizing) the forged blanks at about 1000 C, subsequent soft annealing at about 800 C in preparation for the machining and hardening of the valves heat treatment consisting of around 10200C with tempering at 740 C had to be carried out. Normalization is necessary in order to reduce or largely eliminate the coarseness of the structure that occurs when the blanks are forged due to the heat sensitivity of the steel.
The aim of the invention is to make the cost and energy expenditure caused by the repeated heat treatment unnecessary and to improve the desired properties
EMI1.1
0, 300, 15% Nb, further 0, 005 to 0, 02% B and / or 0, 002 to 0, 1% Al, rest Fe with melting-related impurities.
In comparison, the valve steel according to the invention shows significant advantages over the non-microalloyed steel. The hardness in the naturally hard state, i.e. the hardness of the forged blank, is obviously due to the high degree of excretion, which is significantly lower (290 to 320 HVs compared to 600 to 640 HV,) with the consequence that not only normalization but also soft annealing and heating up the hardening temperature can be dispensed with. The forged blanks can therefore be directly machined and the hardness can be adjusted simply by tempering to the tempering temperature mentioned. The advantages achieved are clear to see.
EMI1.2
hardened from about 310 HVs.
They were then machined and finally annealed twice at 7200C, after which they had the desired hardness of 300 HVs.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0458181A AT370444B (en) | 1981-10-28 | 1981-10-28 | VALVE STEEL |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0458181A AT370444B (en) | 1981-10-28 | 1981-10-28 | VALVE STEEL |
Publications (2)
Publication Number | Publication Date |
---|---|
ATA458181A ATA458181A (en) | 1982-08-15 |
AT370444B true AT370444B (en) | 1983-03-25 |
Family
ID=3565793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT0458181A AT370444B (en) | 1981-10-28 | 1981-10-28 | VALVE STEEL |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT370444B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101967610B (en) * | 2009-07-28 | 2012-07-04 | 宝山钢铁股份有限公司 | High carbon high silicon martensite stainless steel billet and preparation method thereof |
-
1981
- 1981-10-28 AT AT0458181A patent/AT370444B/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101967610B (en) * | 2009-07-28 | 2012-07-04 | 宝山钢铁股份有限公司 | High carbon high silicon martensite stainless steel billet and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
ATA458181A (en) | 1982-08-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ELJ | Ceased due to non-payment of the annual fee |