Boron Steel|Special Steel|From the materials name|Materials|Sales of Special Steel-TENHIKO INDUSTRIAL CO., LTD.[Osaka JAPAN]

Boron Steel

1. Characteristics
2. End applications
3. Usage example
4. Chemical Composition
5. Mechanical properties
6. Heat treatabilities

N22CB has almost same workability as ordinary steel, and N22CB can have hardness as special steel with heat treatment.

Tenhiko have been developing various products using N22CB material for more than 10 years, and we have developed N22CB end application about more than 10 items.
Many customers are sartisfied with usability and reasonable price of N22CB.
We will support you totally from sample request to material's technical support of N22CB. Please feel free to contact us.

Characteristics

· Basic chemical composition type is 0.22% C-0.45% Mn-0.3% Cr-0.003% B,
it does not contain expensive alloy elements such as Ni, Mo, V.
· This products are annealed materials or spheroidizing annealed materials.
· N22CB annealed material's mechanical properties and workabilities are equal to S20C, and it is softer than SCM420.
· The hardenability is almost intermediate between S20C and SCM420, ideal critical diameter D1is about 1.5inch.
· N22CB's carburizing hardenability is a little bit inferior than SCM420,
however it can get the same carburized case depth as S20C in half time.
· Quenched and tempered N22CB material's shock toughness is more superior than well-tempered SCM420.

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End applications

washer, skating edge, sewing machine parts, chain, cluch plate, automobile parts, gear,
round saw, (safety) buckcle, bobbin, door impact,

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Usage example

Agricultural parts:(N22CB)

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Chemical Composition of Nisshi steel co.,ltd's Boron Steel

(mass%)

Chemical Composition	C	Si	Mn	P	S	Cr	B
N22CB	0.20~0.25	≦0.25	0.30~0.60	≦0.030	≦0.030	0.20~0.40	0.001~0.005
N28CB	0.26~0.30	≦0.25	0.30~0.60	≦0.030	≦0.030	0.20~0.40	0.001~0.005
N36CB	0.33~0.38	≦0.25	0.40~0.70	≦0.030	≦0.030	0.40~0.70	0.001~0.005

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Mechanical properties

Hot-rolled mechanical properties example.

Type of steel	Test piece direction of extraction	Yield strength (N/mm²)	Tensile strength (N/mm²)	Elongation(%)	Hardness(HV)
N22CB	L	366	530	34.3	152
N22CB	C	389	538	33.8	152

Notice)Test piece is JIS No.5, thickness is 2.4mm

Annealed material mechanical properties example.

Type of steel	Test piece direction of extraction	Yield strength (N/mm²)	Tensile strength (N/mm²)	Elongation(%)	Hardness(HV)
N22CB	L	276	437	41.0	132
S20C	L	269	434	41.2	128
SCM420	L	389	527	35.0	162

Notice)Test piece is JIS No.5, thickness is 6mm

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Heat Treatability

1.Hardenability

N22CB hardenability correspond to intermediate between S20C and SCM420(Fig.1).

2.Carburizing Hardenability

N22CB carburizing hardenability is a little bit inferior than SCM420.
however it can get the same carburized case depth as S20C in half time.(Fig.2)

Notice)Carburizing is liquid carburizing, and 180℃ salt quenching.

3.N22CB hardened & tempered material's tensile property

Hardened and tempered N22CB has excellent toghness which shows about 10% elongation even without tempering.(Fig.3).

Notice)
1)Test piece is JIS No.5, direction of extraction is L,thickness is 2.6mm
2)Quenching condition is 900℃-15min W.Q.
3)Tempering time is 30min

4.Relations between impact value and tempering hardness.

Quenched and tempered N22CB material's shock toughness is more superior to well-tempered SCM420.(Fig.4).

Notice)
1)Shocked test piece is 2mmU notch Charpy(t=6mm)
2)Heat treatment condition is 870℃-15Min W.Q.
3)Testing temperature is 25℃
4)Tempering time is 30min

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Notice

These N22CB material information in this page is based on NIPPON STEEL CORPORATION product technical data.

There are some cases maker do not accept the production depending on the production lot and specification.

Technical information in this website,while every reasonable effort was made to ensure the accuracy at the time of this publication, is general information relating to our products only and is not meant as any warranty,expressed or implied.
Such technical information does not guarantee that any of our products are suitable for your particular application or purpose. Use of any information contained in this website shall be at user's risk. Any information in this website is subject to change without prior notice. Please contact our company for up-dated information.