NM450およびAR450スチールの概要

NM450:

中国から始まった, 広く製造されている場所.
“ニューメキシコ州” のために “耐摩耗性鋼” in Chinese standards.
の “450” represents its nominal hardness value, typically around 450 HBW (ブリネル硬度).

AR450:

A globally recognized grade, especially under American standards.
“AR” のために “Abrasion Resistant.”
Similarly, “450” indicates a hardness value of approximately 450 HBW.

仕様

仕様	AR400 / 400F	AR450 / 450F	AR450 / 500F
硬度 (BHN)	400 (360 min.)	450 (429 分)	500 (450 min.)
炭素 (マックス)	0.20	0.26	0.35
マンガン (分)	1.60	1.35	1.60
リン (マックス)	0.030	0.025	0.030
硫黄 (マックス)	0.030	0.005	0.030
シリコン	0.55	0.55	0.55
クロム	0.40	0.55	0.80
他の	Additional Alloying elements may be added for enhancing abrasion resistant properties.	Additional Alloying elements may be added for enhancing abrasion resistant properties.	Additional Alloying elements may be added for enhancing abrasion resistant properties.
Size Range	3/16″ – 3″ (Widths 72″ – 96″ – 120″)	3/16″ – 3″ (Widths 72″ – 96″ – 120″)	1/4″ – 2 1/2″ (Widths 72″ and 96″)

主な違い

1. 化学組成

NM450:
NM450 often contains higher carbon and alloying elements like chromium, モリブデン, とマンガン. These contribute to excellent wear resistance and hardenability. しかし, it may be slightly less weldable due to its chemical makeup.
AR450:
AR450 tends to have a more balanced composition, offering good weldability and forming capabilities. The alloying elements are optimized for both toughness and abrasion resistance.

2. 製造基準

NM450 adheres to Chinese standards (例えば。, ギガバイト/トン 24186-2009), while AR450 complies with international or American standards like ASTM or EN.
AR450 plates are often certified for stricter tolerances and more uniform mechanical properties.

3. Toughness and Impact Resistance

AR450 generally exhibits higher toughness, making it better suited for applications where impact loads are present.
NM450 is designed primarily for abrasion resistance, and its toughness may be slightly lower in comparison.

4. Weldability and Formability

AR450 is typically easier to weld and form, thanks to its balanced chemical composition.
NM450, while weldable, requires preheating and post-welding treatments to minimize cracking due to its higher carbon content.

5. Cost and Availability

NM450 is often more cost-effective, especially in markets where Chinese steel is readily available.
AR450 can be more expensive, but it offers consistent quality and adherence to global standards.

Similarities

Both NM450 and AR450:

Deliver excellent resistance to abrasion and wear.
Are commonly used in industries like mining, 工事, and material handling.
Feature hardness levels around 450 HBW, making them suitable for heavy-duty applications.
カット可能, 溶接された, and shaped with proper tools and techniques.

アプリケーション

NM450 Applications

掘削機のバケットとブレード.
Wear liners for mining and quarrying equipment.
Conveyor systems and truck bodies.
Components exposed to severe abrasive conditions.

AR450 Applications

Dump truck beds and chassis.
Construction equipment parts, such as bulldozer blades and loader buckets.
Heavy machinery subjected to both abrasion and impact.
Material transport systems.

結論

Choosing between NM450 and AR450 depends on the specific requirements of your application. If cost efficiency and abrasion resistance are priorities, NM450 may be the ideal choice. 一方で, for applications requiring a balance of wear resistance, 靭性, and global certification, AR450 stands out as a reliable option.

Understanding the properties and limitations of each grade ensures optimal performance and longevity in demanding environments.