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Anonymous users2024-01-23It's spring steel.
Spring steel refers to steel that is specifically used to make springs and elastic elements due to its elasticity in the quenched and tempered state. The elasticity of steel depends on its ability to elastically deform, that is, within the specified range, the ability to elastically deform makes it withstand a certain load, and there is no permanent deformation after the load is removed.
Spring steel should have excellent comprehensive properties, such as mechanical properties (especially elastic limit, strength limit, yield ratio), elastic resistance (i.e., elastic resistance to shrinkage, also known as anti-relaxation performance), fatigue properties, hardenability, physical and chemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). In order to meet the above performance requirements, spring steel has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), precise shape and size.
According to the GB T 13304 "Steel Classification" standard, according to the basic performance and use characteristics of the first, spring steel belongs to the steel used in mechanical structures; According to the quality class, it belongs to special quality steels, i.e. steels that require particularly strict control of quality and performance during the production process. According to the habits of our country, spring steel belongs to special steel.
3 + 2 + 1, the front of the 3 rows should be about meters, according to the national standard is between meters, 2 single according to the normal pendulum method is on the side of each width should be about 80 cm, the depth is about 90 cm, the 1 is the chaise sofa that can lie down, the width is about 1 meter, so the width of the 3 + 2 + 1 normal pendulum method is about 4 meters, of course, it depends on the seat depth of the sofa you buy, the seat depth determines the width of the position occupied by the 2 single sofas.
BC flute type packaging cartons, if it is long-distance transportation, but also add inner packaging, the carton is best to use K paper as face paper.
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Generally, the seat height of the single sofa should be kept at about 42 cm, and the seat height of the sofa should be consistent with the height of the bent knees to make people feel comfortable. The seat height of large sofas in Europe and the United States will be between 40-45, which is basically good. The seat height of a two- or three-seater sofa is the same as that of a work-seat sofa.