DAHE STEEL STRUCTURE CO.,LTD.

Transcription

1 DAHE ENTERPRISES LIMITED DAHE STEEL STRUCTURE CO.,LTD.

2 FOREWORD FOREWORD Dahe Enterprises Ltd registers in Hong Kong. She owns two sole-investment companies Dahe Steel Structure (HK) Co., Ltd & Nanhai Dahe Steel Structure Co., Ltd. She also holds two joint venture companies Dahe Bolts Structure (HK) Co., Ltd & Nanhai Lucul Grating Co., Ltd. The production base is in Nanhai District, Foshan City, Guangdong Province, China. The factory is established in It locates in Nanhai District, Foshan City belongs to Pearl River Delta and possess a area of 33,000 square meter. The factory comprises Eastern Zone, Western Zone, Middle Zone and Northern Zone, which is distributed in Shuitou Industrial park, Yayao Industrial park, Dali Town; Songxia Industrial park, Shishan Town. The eastern factory mainly produces press welding grating. The western and middle factory mainly manufactures ball joint handrailing. The northern factory mainly fabricates steel structure members, hot bending components and fasteners etc. 2

3 FOREWORD HEATING SWAGING ROLLING HEAT TREATMENT 3

4 FOREWORD 4

5 STAINLESS STEEL FASTENERS AUSTENITIC STEEL GROUP Chromium-nickel steels which are made resistant to corrosion by the self-generated chromium oxide. If the chromium oxide film is damaged, it will restore itself as long as there is oxygen in the environment. However, if access of oxygen is hampered by unfavorable designs or contamination, corrosion will occur. All austenitic stainless steel fasteners are normally non-magnetic, but after cold working, some magnetic properties may be evident. A4 Chromium-nickel acid proof steels, which are molybdenum alloyed and give a considerably better resistance to corrosion than A1, A2, A3.They are used to a great extent by the cellulose industry as this steel grade is developed for boiling sulfuric acid and is to a certain extent also suitable in an environment with chloride content. They are also frequently used by the food processing industry and by the marine industry. A5 Stabilized acid proof steels, with properties similar to A4. In this steel grade, due to the additive content of Ti, Nb or Ta, this elements appetency with carbon are better than chromium, reduce the chance of chromium carbide to replace chromium oxide, it is available to avoid the happening of lean chromium and intergranular corrosion, induce the chromium oxide content arrive at maximum. DAHE stainless steel fasteners designation DAHE stainless steel fasteners manufacturing standard is according to BS EN ISO , Stainless steel composition specifications GRADE CHEMICAL COMPOSITION % C Si Mn P S Cr Ni Mo Cu Ti A A xC 0.8 Mechanical properties for bolts, screws and studs GRADE PROPERTY CLASS TENSILE STRENGTH min. N/mm 2 STRESS AT 0.2% PERMANENT STRAIN min. N/mm 2 ELONGATION AFTER FRACTURE min. mm A4 A d Mechanical properties for nuts GRADE PROPERTY CLASS NORMAL NUTS m 0.8d THIN NUTS 0.5d m 0.8d NORMAL NUTS m 0.8d STRESS UNDER PROOF LOAD min. N/mm 2 THIN NUTS 0.5d m 0.8d A4 A

6 STAINLESS STEEL FASTENERS A4-80 A5-80 STAINLESS STEEL HEXAGON HEAD BOLTS, SCREWS STANDARD BS 3692 STEEL GRADE: BS EN ISO A4, A5 PROPERTY CLASS: BS EN ISO CLASS 80 TENSILE STRENGTH: 800 N/mm2 A4 A DIMENSIONS OF STAINLESS STEEL HEXAGON HEAD BOLTS mm Size and thread dia. d Pitch of thread (coarse pitch series) Thread runout a Diameter of unthreaded shank d Width across flats s Width across corners e Diameter of washer face d f Depth of washer face c Transit ion diamet er d a Radius under head r Height of head k Eccentr Eccentricity icity of of shank head and split pin hole to the thread max. max. min. max. min. max. min. max. min. max. max. max. min. max. min. max. max. M M M M M M M M M M M M M M M M M M M M M M M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48 M52 M56 M60 M64 M68 6

7 STAINLESS STEEL FASTENERS A4-80 A5-80 STAINLESS STEEL NUTS STANDARD BS 3692 STEEL GRADE: BS EN ISO A4, A5 PROPERTY CLASS: BS EN ISO NORMAL STYLE NUTS: CLASS 80 THIN NUTS: CLASS 040 STRESS UNDER PROOF LOAD: BS EN ISO NORMAL STYLE NUTS: 800N/mm2 THIN NUTS: 400N/mm2 A4 A DIMENSIONS OF STAINLESS STEEL HEXAGON NUTS mm 7

8 STAINLESS STEEL FASTENERS A4-80 A5-80 STAINLESS STEEL STUDS STANDARD: BS EN ISO STEEL GRADE: BS EN ISO A4, A5 PROPERTY CLASS: BS EN ISO CLASS 80 TENSILE STRENGTH: 800 N/mm2 A4 A DIMENSIONS OF STAINLESS STEEL STUDS mm 8

9 STAINLESS STEEL FASTENERS A4, A5 STAINLESS STEEL WASHERS STANDARD: BS 4320 STEEL GRADE: BS EN ISO 3506 A4, A5 A4 A ID OD DIMENSIONS OF STAINLESS STEEL WASHERS mm NOMINAL SIZE OF FORM A FORM C FORM E BOLT OR SCREW OD ID t OD ID t OD ID t M M M M M M M M M M M M M M M M M M M M M

10 STAINLESS STEEL FASTENERS A4 A5 STAINLESS STEEL SPRING WASHERS SINGLE COIL SQUARE SECTION STANDARD: BS 4464 STEEL GRADE: BS EN ISO 3506 A4, A5 A4 A DIMENSIONS OF STAINLESS STEEL SPRING WASHERS mm NOMINAL SIZE OF BOLT OR SCREW OD ID t M M M M M M M M M M M M M M M M M

11 STAINLESS STEEL FASTENERS DUPLEX STAINLESS STEEL BOLTS, SCREWS, STUDS, WASHERS AND NUTS DUPLEX STAINLESS STEEL FERRITTIC-AUSTENITIC STRUCTURE STEEL GROUP FA is not included in ISO , ISO , AND ISO but will most probably be included in the future. Steels of this steel group are the so-called deplex steels. The first FA steels to be developed had some drawbacks that hace been eliminated in the recently developed steels.fa steels have better properties than steels of the types A4 and A5 especially as far as strength is concerned. They also exhibit superior resistance to pitting and crack corrosion. STEEL GRADE: BS EN NAME: X2CrNiMoN NUMBER: ; X2CrNiMoN NUMBER: TENSILE STRENGTH: 650 to 880 N/mm2 MANUFACTURE STANDARD: BS 3692 WASHERS STANDARD: BS 4320 GRADE C max. Si max. Mn max. CHEMICAL COMPOSITION % P S Cr Ni Mo N to to to to to to to to 0.35 M64 M68 M8 M10 M12 M60 M14 M56 M16 M52 M18 M48 M20 M45 M22 M42 M24 M39 M27 M36 M33 M30 11

12 GALVANIZING STEEL FASTENERS SHERARDIZING STEEL FASTENERS The good protective characteristics of zinc coatings,their relatively high intrinsic resistance under natural conditions and the simplicity and variety of the technogical processes available for their deposition have secured the widest use of these coatings in practice SHERARDIZING is one of the processes used to produce a zinc coating on iron and steel substrates. In 1996, DAHE started its sherardizing for zinc coating fasteners. The sherardized coating differs from the other main zinc coatings in that the coating consists not of pure zinc but entirely of iron-zinc alloys representing a series of intermetallic compounds of iron and zinc and solid solutions of zinc in iron and of iron in zinc. An important feature of the coating is its very good abrasion resistance the iron-zinc alloy layer producing a surface coating harder than any of the orther zinc coatings.the sherardizing coating has a dull matt-grey appearance which although is uniform is not smooth like an electrogalvanized finish.the surface texture of the coating provides a good bond for oils paints and lacguers. It is advisable to passivate the surface prior to the application of powder paints. The mechanical properties of steel in general are not affected and the temperatures employed are low enough to avoid many of the problems of heat distortion. Spring steels and heat treated component are processed at even lower temperatures than normal thereby avoiding any significant effect on the mechanical properties. The sherardizing process is ideally suited for the surface treatment of high tensile steels which are susceptible to hydrogen embrittlement. The range of applications of the process is enormous and apart from the huge quantities of scaffold clips, hinges, nuts, bolts, chains, washers,screws and nails used in the building construction and engineering industries, the process is used to good effect in the electrical trade domestic appliances telecommunications as well as the automotive industry. There are three converters in DAHEs factory for sherardized fasteners and orther iron or steel components, the capacity is over 2,400kg per day, four meters length components can be sherardizing. DAHEs Sherardizing is in accordance with British Standard BS4921 DAHEs sherardized fasteners products is conform to British Standard BS7371 Part 8 requirements. GALVANIZING STEEL FASTENERS There are many types of coatings that are specified as hot dip galvanised. The process involves immersing steel in molten zinc. The zinc reacts with the steel to form the galvanised coatings. The time the steel is immersed in the zinc along with post-galvanizing treatment controls the coating thickness, appearance and other characteristics. Hot dip galvanised coatings are applied to steel to improve the anti-corrosion performance of the steel to ensure that it lasts as long as possible with a minimum of maintenance. Long term protection for structural fasteners is obtained by galvanizing to BS EN ISO 1461 (BS729) with a specified minimum thickness range of 0.4mm for the coating. Normal coating thicknesses range from 50 to 100um; again the nut thread is overtapped by 0.4mm, to accommodate the coating. DAHEs Hot Dip Galvanizing is in accordance with British Standard BS EN ISO 1461 (BS729) DAHEs hot dip galvanized fasteners products is conform to British Standard BS7371 Part 6 requirements. 12

13 HEXAGON HEAD BOLTS & SCREWS HEXAGON HEAD BOLTS AND SCREWS Manufactured to the dimensions and mechanical properties of BS3692 STRENGHT GRADE 4.6,4.8,5.6,5.8,6.6,6.8,8.8,10.9,12.9,14.9 DIMENSIONS OF HEXAGON HEAD BOLTS mm Size and thread dia. d Pitch of thread (coarse pitch series) Thread runout a Diameter of unthreaded shank d Width across flats s Width across corners e Diameter of washer face d f Depth of washer face c Transit ion diamet er d a Radius under head r Height of head k Eccentr icity of head Eccentricity of shank and split pin hole to the thread max. max. min. max. min. max. min. max. min. max. max. max. min. max. min. max. max. M M M M M M M M M M M M M M M M M M M M M M

14 HEXAGON HEAD BOLTS & SCREWS HEXAGON HEAD BOLTS AND SCREWS Manufactured to the dimensions and mechanical properties of BS3692 STRENGHT GRADE 4.6,4.8,5.6,5.8,6.6,6.8,8.8,10.9,12.9,14.9 MECHANICAL PROPERTIES OF STEEL BOLTS AND SCREWS Mechanical property Strength grade designation Tensile strength R m Brinell hardess kgf/mm min N/mm kgf/mm max N/mm min HB max HB Rockwell hardess min max HRB HRC HRB HRC Vickers hardness Yield stress R e Stress at permanent set limit R 0.2 min Hv30 max kgf/mm min N/mm min kgf/mm min N/mm Stress under proof load S p Elongation A after fracture min % Strength under wedge loading Charpy impact strength min S p /R e kgf/mm N/mm The values for full size bolts equals the minimum values for tensile strength shown above kgfm/cm ftlbf

15 HEXAGON HEAD BOLTS & SCREWS HEXAGON HEAD BOLTS AND SCREWS Manufactured to the dimensions and mechanical properties of BS3692 STRENGHT GRADE PROOF LOADS FOR BOLTS AND SCREWS Nominal size Tensile stress area mm 2 4.6,4.8,5.6,5.8,6.6,6.8,8.8,10.9,12.9,14.9 Strength grade designation Stress under proof load kgf/mm Proof load metric tonne force (1000 kgf) M M M M M M M M M M M M M M M M M M M M M M

16 HEXAGON HEAD BOLTS & SCREWS HEXAGON HEAD BOLTS AND SCREWS Manufactured to the dimensions and mechanical properties of BS3692 STRENGHT GRADE 4.6,4.8,5.6,5.8,6.6,6.8,8.8,10.9,12.9,14.9 DIMENSIONS OF HEXAGON NUTS mm Nominal size and thread diameter d Pitch of thread (coarse pitch series) Width across flats s Width across corners e Thickness of normal nut m Tolerance on squareness of thread to face of nut Eccentricity of hexagon Thickness of thin nut t max min max min max min max max max min M M M M M M M M M M M M M M M M M M M M M M MECHANICAL PROPERTIES OF STEEL NUTS 16

17 HEXAGON HEAD BOLTS & SCREWS HEXAGON HEAD BOLTS AND SCREWS Manufactured to the dimensions and mechanical properties of BS3692 STRENGHT GRADE 4.6,4.8,5.6,5.8,6.6,6.8,8.8,10.9,12.9,14.9 PROOF LOADS FOR HEXAGON NUTS Nominal size Tensile stress area mm 2 Strength grade designation Stress under proof load kgf/mm Proof load metric tonne force (1000 kgf) M M M M M M M M M M M M M M M M M M M M M M

18 HEXAGON HEAD BOLTS & SCREWS HIGH STRENGTH FRICTION GRIP BOLTS Manufactured to the dimensions and mechanical properties of BS4395 HSFG DIMENSIONS OF HEXAGON HEAD BOLTS M12 M16 M20 M22 M24 M27 M30 M36 P d s e d f Max Min Max Min Max Min Max Min c Max r Max Min d d Max mm k Max Min MECHANICAL PROPERTIES OF BOLTS M12 M16 M20 M22 M24 M27 M30 M36 Pitch P mm Tensile stress area A s mm Min Min Min Min Max Brinell HB Min Max Rockwell HRC Min Max Vickers HV30 Min

19 DIMENSIONS OF HEXAGON NUTS mm M12 M16 M20 M22 M24 M27 M30 M36 P s e Max Min Max Min d f Max Min c Max m Max Min Max MECHANICAL PROPERTIES OF HEXAGON NUTS 19

20 B C DIMENSIONS OF FLAT ROUND WASHERS mm M12 M16 M20 M22 M24 M27 M30 M36 B Max Min C Max Min t Max Min HARDNESS OF FLAT ROUND WASHERS Rockwell C Scale 38 to 45 HRC 6mm 7mm 8mm 1.6mm M M M A B A 45 C A DIMENSIONS OF SQUARE TAPER WASHERS Inside diameter Mean thickness Nominal size and B Overall size A thread diameter C max. min. 3 o and 5 o Taper 8 o Taper M M M M M M M M

21 RAIL BOLTS & SCREWS 21

22 RAIL BOLTS & SCREWS DAHE ENTERPRISES LIMITED dahe.com Address: Room 1412,14/F,Sun Hing Building,No.607,Nathan Road, Mongkok, Kowloon, Hong Kong. Tel: Fax: Dahe Steel Structure (HK) Co.Ltd. Address: No.18 M/F Sai Yuen Lane. Des Vdeux Road (W) HK. Tel: Fax: FACTORY Address: No.24,1 Road (S), Shuitou Industrial Zone, Dali Town, Nanhai, Foshan, Guangdong, China. Tel: (86) , Fax: (86) , Postcode: