High tensile strength stainless

fasteners

BUFAB STAINLESS HISTORY1674 Svartå Bruk was founded1912 Svartå Bruk was

incorporated into the Hasselfors group.

1947 Production of Stainless Steel Fasteners started.

1966 The melting house was closed down.

1975 Change of name to Hasselfors Stainless.

1660 Åshammar Forging & Nail Factory was founded.

1899 Åsh Forging & Nail change to Åshammars Bolt Factory and the fastener production started.

1926 Production of Stainless Steel fasteners started.

1947 Åsh Bolt Factory was incorporated into the the Bulten group.

1982 The two companies merged into Bulten Stainless

1992 The cold heading were moved to Åshammar and Svartå concentrated in machining / marketing/ logistics.

2000 Finnveden invest, the new owner of Bulten.

2004 Change of name to Bufab Stainless AB

2005 Nordic Capital acquire Finnveden and divide Bufab as

own group from Finnveden

The ”Good old days”

Fastener production 1904

The Bulten head office 1897

Volvo Ocean Race(former Whitbread Round the World Race)

Volvo Ocean Race. ASSA Abloy.12 PCs of M30 Bolts = 11 Kg

Strength 1550 MPa ~225 ksi

Whitbread Round theWorld Race.EF Language.18 PCs of M39 Bolts = 36 Kg

Strength 700 MPa ~101 ksi

Technique• Cold heading• Hot forging• Machine finishingMachines• Cold headers• Thread rollers• CNC machines• Nut formers• Hot forging linesSize range• M2 - M42

Production

• Design• Production• Know-how • Technical support

Engineering

Quality• ISO 9001• ISO 14001• QS 9000• PED No 97/23/EC

High performance products

Unique products• BUMAX 88• BUMAX 109• BUMAX 129 • BUMAX LDX (Under development)• BUMAX 149 – 200 (Under development)• BUMAX HARD• High temperature products

For end users with stringent requirements for the best performance

• The strongest stainless steel fasteners in the market• Lower weight, higher strength• Superior resistance to corrosion• High and low temperature • Non-magnetic• Complete assortment in stock

The benefits of BUMAX

8.8

10.9

12.9

BUMAX 88

BUMAX 109

BUMAX 129

BUMAX 149

BUMAX 200

A4-80Steel bolt standard Stainless steel

bolt standard

Tensile strength 1 200 MPa (174 ksi)

Yield strength 90% of 1 200 = 1 100 MPa (160 ksi)

Strength Range Tensile strength Yield strength ElongationGroup/type class Rm Rp 0.2

M Inch N/mm2 PSI N/mm2 PSIA4-80 (316) 80 M5 - M24 3/16 - 1 800 116,000 600 87,000 0.3 x dBUMAX 88 80 M3 - M36 1/8 - 1 3/8 800 116,000 640 92,800 0.4 x d

BUMAX 109 100 M6 - M12 1/4 - 1/2 1000 145,000 900 130,500 0.2 x d

Mechanical properties

• 1 Mpa = 1 N/mm2 = 145 psi

• BUMAX 88/109 are made in material 316L HiMo

• PED elongation min 0.4 x D

0

400

600

800

1 000

1 200

200

N/mm2

800

1 100

640760

900980

9301 000

BUMAX 88 BUMAX 109 BUMAX 88 BUMAX 109

Specification

Typical testresult

Tensile(Rm)

Tensile(Rm)

Yield(Rp)

Yield(Rp)

M20 M14 M12 M10A4-50 A4-70 88 109

• Lower weight• Higher strength• Smaller screw joints• Replace 8.8 and 10.9

Steelgrade C max Cr Ni MoA2 (304) 0.08 18.0 - 20.0 8.0 - 10.0A4 (316) 0.08 16.0 - 18.0 10.0 - 14.0 2.0 - 2.5BUMAX (316L HiMo) 0.03 16.5 - 18.5 11.0 - 14.5 2.5 - 3.0

Chemical composition

% sulphuric acidEN ASTM 3 10 20

1.4301 304 1.08 3.001.4401,1.4404 316,316L 0 0.32 1.30

1.4436 316L HiMo (BUMAX) 0 0.04 0.44

General corrosionTest in Sulphuric acid H2SO4 at 50 C (122 F)

The corrosion rate is expressed as mm/year(Test made by Sandvik, Sweden)

Pitting/crevice CorrosionPRE-value (Pitting Resistance Equivalent)

PRE = % Cr + 3,3 x % Mo + 16 x % N

PRE > 40 is totally resistance against pitting/crevice corrosion in sea-waterPRE >40 (254 SMO,SAF 2507) BSI manufactures in these steels

EN ASTM % Cr % Mo % N PRE1.4301 304 16.0 - 18.0 16.00 - 18.00

1.4401,1.4404 316,316L 16.0 - 18.0 2.0 - 2.5 22.60 - 26.251.4436 316L HiMo (BUMAX) 16.5 - 18.5 2.5 - 3.0 24.75 - 28.40

CR.

10

9

8

7

6

5

4

3

2

1

0

12 14 16 18 20 22 24 26 28 30 32 PRE

Pitting/crevice CorrosionPRE-value (Pitting Resistance Equivalent)

PRE = % Cr + 3,3 x % Mo + 16 x % N

Corrosion rating after ten years expose to marine atmosphere as a function of alloying element content. (CR up to 3 = no corrosion)

AISI 304L

AISI 316L

Bumax

CR3

Steel grade Yield strength Maximum relative permabilityand class N/mm2 PSI km

A2-70 (304) 450 65,000 1.400A2-80 (304) 600 87,000 1.800A4-80 (316) 600 87,000 1.012BUMAX 88 (316L HiMo) 640 92,800 1.006BUMAX 109 (316L HiMo) 900 130,500 1.007

Permeability

Permeability is a measurement on a materials ability to let a magnetic field go through and it’sdescribed as the permeability value km. This is the value for the permeability of a material inrelation with to vacuum, where Km 1,000 is totally non-magnetic.

BUMAX can be regarded as non magnetic.

High temperature applications

Remaining Yield strength in % of RTSteel and 100ºC 200ºC 300ºC 400ºC 500ºC 600ºCstrength class 218 F 398 F 578 F 758 F 938 F 1118 FA4 80 (316) 85 80 75 70BUMAX 88 90 90 85 80 75 70BUMAX 109 95 95 95 90 90 85

Mechanical properties at high temperature

Note: creep strength at around 550ºC

BUMAX 88 PED can be used from -200 ºC up to 400 ºC

The solution(Working temperature 350 - 450ºC)

BUMAX 88M36 studs + nuts

• Higher temperature resistant• Higher strength• Higher tightening torque

Pressure vessel fastenersapproved by TÜV toPED No 97/23/EC

(2002-06-01)

Pressure equipment

> 0,5 barabove

atmospheric

Pressure

(1013mbar)

M8

A2/A4-505.6

A2/A4-708.8

PED200 MPa (SS)200 MPa (S)

ADW 2450 MPa (SS)640 MPA (S)

Before PED 2002-05-30

M8 (SS)

M8 (S) M14/16

(S)

M10/12(SS)

2002-08-01

BUMAX 88640 MPa (SS)

BUMAX 88

M6

Mechanical propertiesTensile strength Rm N/mm2 1 200 (174 ksi)Yield strength RP 0,2/mm2 1 100 (160 ksi)Elongation min 0,2 x d

Material • 254 SMO • 1.4313

Chemical compositionC 0,02 Cr 19,5-20,5 Ni 17,5-18,5 Mo 6,0-7,0C 0,05 Cr 12,0-14,0 Ni 3,5-4,5 Mo 0,3-0,7

Material under testing.LDX 2101, EN 1.4161 (Outokumpu, former Avesta polarit)

BUMAX 129 (special item)

Dacromet

Zinc

Copper

Silver

Surface treatment

Material Outokumpu LDX (Lean Duplex)

StandardsEN 1.4162 ASTM 32101

Mechanical propertiesTensile strength Rm N/mm2 1 250Yield strength Rp 0,2/mm2 1 020Elongation min > 0,85 x d

Corrosion resistanceIn between A2 and A4 – closer to A4

Chemical compositionC 0,03 N 0.22 Cr 21.5 Ni 1.5 Mo 0.3

BUMAX LDX

Mechanical propertiesTensile strength Rm N/mm2 1 400 - 2 000 (203 - 290 ksi)Yield strength RP 0,2/mm2 1 200 - 1 800 (174 - 261 ksi)Elongation min < 0,2 x d

Material Sandvik Nanoflex

Chemical compositionC 0,02 Cr 12,0 Ni 9,0 Mo 4,0 Cu 2,0 Ti 0,9 Al 0,4

BUMAX 149 – 200 (Under development)

We have reached

Rm 1 700 N/mm2

RP 1 600 N/mm2