TAILIEUCHUNG - Volume 01 - Properties and Selection Irons, Steels, and High-Performance Alloys Part 5

Tham khảo tài liệu 'volume 01 - properties and selection irons, steels, and high-performance alloys part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | and take their chances on occasional difficulties. In conventional practice depth of machining for hot-rolled bars is mm 16 in. for bars 38 to 76 mm 12 to 3 in. in diameter and mm 1 in. for bars over 76 mm 3 in. in diameter. Reference cited in this section 1. Alloy Carbon and High Strength Low Alloy Steels Semifinished for Forging Hot Rolled Bars Cold Finished Bars Hot Rolled Deformed and Plain Concrete Reinforcing Bars AISI Steel Products Manual American Iron and Steel Institute 1986 Surface Treatment It is uncommon for hot-rolled steel bars and shapes to be descaled by the producer or protected from the weather during transit. Most cleaning and coating operations are done either by the customer or by an intermediate processor. Descaling of hot-rolled bars and shapes is generally done by either pickling or blasting depending on the end use. There are several subsequent coatings that can be used. Oil is both the simplest and the least expensive to use and acts as a temporary rust preventive. Lime in addition to serving as a rust preventive can serve as a carrier for lubricants used during cold drawing or cold forging. A more sophisticated system includes descaling followed by a zinc phosphate coating coupled with a dry lubricant. This system provides some rust protection and serves as a lubricant for coldforming operations. Heat Treatment Hot-rolled low-carbon and medium-carbon steel bars and shapes are often used in the as-rolled condition but hot-rolled bars of higher-carbon steel and most hot-rolled alloy steel bars must be heat treated in order to attain the hardness and microstructure best suited for the final product or to make them suitable for processing. Such heat treatment consists of one or more of the following some form of annealing stress relieving normalizing quenching and tempering. Ordinary annealing is the term generally applied to heat treatment used to soften steel. The steel is heated to a suitable temperature held there for some period

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.