定价： 1665元 / 折扣价： 1482 元 加购物车

定价： 2830元 / 折扣价： 2519 元 加购物车

定价： 1665元 / 折扣价： 1482 元 加购物车

定价： 816元 / 折扣价： 727 元 加购物车

定价： 1840元 / 折扣价： 1638 元 加购物车

定价： 1840元 / 折扣价： 1638 元 加购物车

定价： 541元 / 折扣价： 482 元 加购物车

定价： 916元 / 折扣价： 816 元 加购物车

定价： 1290元 / 折扣价： 1149 元 加购物车

定价： 541元 / 折扣价： 482 元 加购物车

定价： 1290元 / 折扣价： 1149 元 加购物车

定价： 571元 加购物车

定价： 515元 加购物车

This specification covers flanged U-channel carbon steel posts having a nominal weight ranging from 0.75 to 6.0 lb/ft and a nominal width ranging from 1.25 to 4.0 in. These posts are furnished in the as-wrought condition intended for applications requiring high tensile strength or crashworthiness and with a lower carbon (LC) designation for use where higher ductility or improved weldability are required. This specification indicates that tension tests and tensile tests are conducted on the flanged steel U-channel posts, and notes that retesting for failed mechanical properties may be permitted.1.1 This specification covers flanged U-channel carbon steel posts having a nominal weight ranging from 0.75 lb/ft to 6.0 lb/ft and a nominal width ranging from 1.25 in. to 4.0 in. These posts are furnished in the as-wrought condition intended for applications requiring high tensile strength or crashworthiness and with a lower carbon (LC) designation for use where higher ductility or improved weldability are required. These materials are available in multiple yield strength levels of 50 ksi, 60 ksi, 70 ksi, and 80 ksi (345 MPa, 420 MPa, 485 MPa, and 550 MPa). The 50 ksi and 60 ksi (345 MPa and 420 MPa) yield strength grades are available as lower carbon posts, designated as Grades 50LC or 60LC.NOTE 1: This specification does not cover high-strength low-alloy (HSLA) post. Refer to Specification A572/A572M for HSLA. For structural Grade 36, refer to Specification A36/A36M.1.2 Units—The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

4.1 A properly collected face channel sample that includes the total coal bed interval provides a sample that is a representative cross section of the coal bed at the point of sampling. Channel samples are taken for subsequent testing needed for evaluation of coal quality and characterization for commercial evaluations, for planning of mining operations to maintain coal quality, for the determination of coal rank in accordance with Classification D388, and for geologic coal resource studies.NOTE 1: Because of the potential for lateral variability, a sample may not represent the quality of the coal bed at another sample point. The reliability of the data generated from channel samples is dependent on the number and spacing of the sample points and the variability of the coal characteristics in a given area.NOTE 2: Sampling of the mine product for these purposes is unsatisfactory because of contamination of the product with out-of-seam material, selective mining of parts of a seam, inability to obtain samples from one or more specific locations in the mine, or other incompatibility of the purpose of sampling with the mining practice. Conversely, channel samples should not be used for evaluation of the quality of commercial shipments of the mine product, which should be sampled in accordance with Methods D2234/D2234M.1.1 This practice describes procedures for collecting a coal sample from a channel extending from top to bottom in the face of a coal seam in a mine.1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary information, see Note 2.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车