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Henan BEBON international co.,ltd located in zhengzhou ,henan province of china. Since it was established in 2008, Henan BEBON has earned an outstanding reputation for its professional exporting shipbuilding steel.About the products,we mainly specialized in steel products for shipbuilding which have been approved by some authoritative classification societies,likeLR,BV,ABS,DNV,GL and so on . Besides, we have three big warehouses--Zhengzhou,Tianjin and shanghai.
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SAPH440 implementation standards

SAPH440 is a kind of automotive structural steel, and its material/grade is SAPH440. The main origin of this steel is Baosteel, and the implementation standards include Q/BQB 310-2009 and JIS G3113 (2006). SAPH440 has high ductility and tensile strength. The specific requirements are ductility ≥30%, tensile strength ≥440Mpa, and yield strength ≥305Mpa. In addition, SAPH440 also has good cold forming performance and is suitable for automotive structural parts. The main domestic manufacturer of SAPH440 is Baosteel. This grade of steel can also be delivered according to Japanese standards, but it needs to be booked in advance. Baosteel's products are recognized by Japanese companies such as Toshiba, Hitachi, Mitsubishi, Toyota, Honda, etc.SAPH440 steel is hot rolled structural steel in plate, sheet and strip form for automotive structural applications. SAPH440 is the material grade and designation defined in the JIS G 3113 standard. JIS G 3113 is a Japanese material standard for hot-rolled steel plates, sheets, and strips used in automobile structures. Structural quality hot-rolled SAPH440 steel has more reliable tensile strength than SAPH400 steel. It can be used in automotive applications where higher strength is required without the material failing if the load is exceeded.

Sources say that SAPH 440 means Steel Automotive Pickled Hot-rolled and 440 MPa minimum tensile strength. Whilst this explanation can be used to remember the material grade specification however SAPH 440 is a grade specified in Japanese standard, where only 440 is defined in the standard for its minimum tensile strength. Other qualities of steel like pickled and hot-rolled are also valid but a reliable source is yet to be found to verify this information.

SAPH440 and Q235 these two materials are automotive sheet metal,through the experiment on mechanical properties, microstructure and bulge forming ability have a comparative study between them. The experimental results showed that: SAPH440 mechanical performance is better than that of Q235,it has small, uniform microstructure grain and strong bulge forming ability. This suggests that the forming performance of SAPH440 is better than Q235. With the rapid development of automobile industry, The design concept of "safety, environmental protection, energy saving" for cars with material and forming technology is put forward higher requirements[1]. Sheet metal forming technology mainly includes the separation process and plastic deformation process, Separation process is a part of the material is separated from the whole or partial separation, Mainly including blanking, punching and trimming, cutting, etc, The plastic deformation process is the external force is applied to deform the material to achieve the desired shape, Mainly including stretching, bending, twisting, curling, spinning, flanging, bulging, etc. Automotive sheet metal formability is refers to the board's ability to adapt to forming technology, formability of sheet metal forming process directly affects productivity, product quality and production costs. Automotive sheet metal formability is related to the forming process, and related to the material of the indicators. Under the condition of process conditions are relatively stable, forming quality depends largely on the performance of the material, So the automotive sheet metal forming performance index is very important[2]. In this paper,there has a comparative study on mechanical performance, organization performance, shape deformation, bulging between automotive sheet metal SAPH440 and Q235 through experiment, it provide experimental evidence for automotive sheet metal stamping process.

Cup drawing experiment is a test sheet metal forming ability to adapt to the limits of auxetic, experiment using the punch for the spherical end of pressure to press the pressure of the sample into membrane, until appear through the crack, as the cup drawing depth measured test results[6]. Through the experiment measured the cup drawing of SAPH440 value is 12.29 mm, Q235 cup drawing of value is 12.15 mm, that means SAPH440 bulge forming ability is stronger than Q235.During Tianjin jinzhao mechanical and electronics development Co. Ltd producting a automobile steering column mounting plate, begin to use Q235 production of the product, due to the product process is relatively complex, there are punching, flanging and bending process,there have cracks , fracture phenomenon with Q235, the product does not meet customer requirements. Finally use SAPH440 production the product, produced products as shown in figure 3, products not only have no cracks and fracture phenomenon, but also in terms of mechanical properties can meet customer requirements, and achieve significant economic and social benefits.

SAPH440 has high tensile strength and yield strength, excellent elongation, low yield ratio, good cold formability characteristics and surface quality compared with Q235 . SAPH440 metallographic organizations is small ferrite and pearlite, fine grains, so from the internal organization to explain the SAPH440 has the characteristics of excellent mechanical properties than Q235 .  In actual production application, SAPH440 mainly applied in the production of complex deformation on automobile parts, meet customer requirements,and create significant economic and social benefits.