Qbh Customized ASTM A193 B7/B7m Alloy Brass Carbon Stainless Steel HDG Half Fully Thread Construction Building Materials Fastener Threaded Rods Formwork

Product Description

Description

ASTM A193 Grade B7 specification covers requirements for high tensile alloy steel bolting material
for use in high temperature or high-pressure service and other special purpose applications.
It is a standard specification defining typical chemical composition, mechanical properties, hardness
requirement, preferential heat treatment, product marking, certification and other requirements,
suitable for bolting used in Pressure Vessel Service, Valves, Flanges and Fittings. ASTM A193
defines both SI (Metric) and inch-pound units.

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength
requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC.
Boltport uses Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed
bolts. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade
2H Nuts for Bolting Carbon Steel pipeline. A193 B7 bolting is available in metric sizes from
M6 to M180 and imperial sizes from 1/4 to 7 inches, in diameter.

Find information on ASTM A193 Grade B7 chemical composition, mechanical properties such as
tensile strength; yield strength, hardness, marking requirements and reference product standards.
 

0.25 Inch To 4 Inch B8M ASTM A193 Grade B7 Threaded Rod

Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications. The ASTM
standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification
includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in 
national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for
diameters above one inch.

Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not
covered in this description including B5, B6, and B16.

Specitications

Standard:	ASTM A193 B7/B7m Stud Bolt Full Thread Rods WZP Carbon Steel
Grade:	1/4"- 4"
Supplier	QBH
Web	qbfastener.en.made-in-china.com
Size:	B7/B7m
Length:	Standard or Non-standard as Request & Design
Surface Treament:	Black, Zinc Plated, Zinc (Yellow) Plated, H.D.G. ,Dacromet,etc.
Material:	Carbon Steel, Alloy Steel, Stainless Steel,etc.
Packing:	25 kgs per box, 36 box per pallet, 900 kgs per pallet
Sample:	Sample are Free

Photo Details

ASTM A193 Grade B7 Chemical Composition

Elements	Range	Product Variation, Over or Under ^B
Carbon	0.37-0.49 % ^D	0.02 %
Manganese, max	0.65-1.10 %	0.04 %
Phosphorus, max	0.035 %	0.005 % over
Sulfur, max	0.040 %	0.005 % over
Silicon	0.15 - 0.35 %	0.02 %
Chromium	0.75-1.20 %	0.05 %
Molybdenum	0.15-0.25 %	0.02 %

 

^B Product analysis - Individual determinations sometimes vary from the specified limits on ranges as
shown in the tables. The several determinations of any individual element in a heat may not vary
both above and below the specified range.

^D For bar sizes over 31/2 in. [90 mm], inclusive, the carbon content may be 0.50 %, max. For the
B7M grade, a minimum carbon content of 0.28 % is permitted, provided that the required tensile
properties are met in the section sizes involved; the use of AISI 4130 or 4130H is allowed.

Heat Treatment

B7 and B7M shall be heat treated by quenching in a liquid medium and tempering. For B7M fasteners,
the final heat treatment, which may be the tempering operation if conducted at 1150 °F [620 °C] minimum,
shall be done after all machining and forming operations, including thread rolling and any type of cutting.
Surface preparation for hardness testing, nondestructive evaluation, or ultrasonic bolt tensioning is permitted.

Unless otherwise specified, material for Grade B7 may be heat-treated by the Furnace, the Induction
or the Electrical Resistance method.

 

ASTM A193 Grade B7 Mechanical Properties - Metric Sizes

Diameter mm	Min Tempering Temperature, °C	Tensile Strength min, MPa	Yield strength, min, 0.2% offset, MPa	Elongation in 4D min, %	Reduction of Area, min, %	Hardness, max
M64 and Under	593	860	720	16	50	321 HBW or 35 HRC
over M64 to M100	593	795	655	16	50	321 HBW or 35 HRC
over M100 to M180	593	690	515	18	50	321 HBW or 35 HRC

 

ASTM A193 Grade B7 Mechanical Properties - Inch Sizes

Diameter Inch	Min Tempering Temperature, °C	Tensile Strength min, ksi	Yield strength, min, 0.2% offset, ksi	Elongation in 4D min, %	Reduction of Area, min, %	Hardness, max
2.5 and under	1100	125	105	16	50	321 HBW or 35 HRC
over 2.5 to 4	1100	115	95	16	50	321 HBW or 35 HRC
over 4 to 7	1100	100	75	18	50	321 HBW or 35 HRC

 

ASTM A193 Grade B7 Bolt Marking

QBH B7

"QBH" Manufacturer's Logo & "B7" Grade Marking

 

A193 Grades

B7	Alloy steel, AISI 4140/4142 quenched and tempered
B8	Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M	Class 1 Stainless steel, AISI 316, carbide solution treated.
B8	Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M	Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

A193 Mechanical Properties

Grade	Size	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min	HBW	HRC
B7	Up to 2-1/2	125	105	16	50	321 max	35 max
	2-5/8 - 4	115	95	16	50
	4-1/8 - 7	100	75	18	50
B8 Class 1	All	75	30	30	50	223 max	35 max
B8M Class 1	All	75	30	30	50	223 max	96 max
B8 Class 2	Up to 3/4	125	100	12	35	321 max	35 max
	7/8 - 1	115	80	15	35
	1-1/8 - 1-1/4	105	65	20	35
	1-3/8 - 1-1/2	100	50	28	45
B8M Class 2	Up to 3/4	110	95	15	45	321 max	35 max
	7/8 - 1	100	80	20	45
	1-1/8 - 1-1/4	95	65	25	45
	1-3/8 - 1-1/2	90	50	30	45

A193 Chemical Properties

Element	B7 (AISI 4140)	B8 (AISI 304)	B8M (AISI 316)
Carbon	0.38 - 0.48%	0.08% max	0.08% max
Manganese	0.75 - 1.00%	2.00% max	2.00% max
Phosphorus, max	0.035%	0.045%	0.045%
Sulfur, max	0.040%	0.030%	0.030%
Silicon	0.15 - 0.35%	1.00% max	1.00% max
Chromium	0.80 - 1.10%	18.0 - 20.0%	16.0 - 18.0%
Nickel		8.0 - 11.0%	10.0 - 14.0%
Molybdenum	0.15 - 0.25%		2.00 - 3.00%

A193 Recommended Hardware

Bolt Grade	Nuts	Washers
B7	A194 Grade 2H	F436
B8 Class 1	A194 Grade 8	SS304
B8M Class 1	A194 Grade 8M	SS316
B8 Class 2	A194 Grade 8	SS304
B8M Class 2	A194 Grade 8M	SS316

Certifications & Package

Our Services

Professional Manufacturer: All of our Fastener are designed and manufactured according to buyers' 
specification and performance.
Quality is guaranteed: Durability testing and critical technical design to enhance fasteners lifetime.
Cost effective: Competitive prices with professional factory supply
Perfect fastening solution with 15+ years experiences to solve your problem: Wide range of parts selection.
Customized Ideal Fasteners: customized services according to the samples and drawings offered.

Free Samples for Standard Fastener from Jiaxing City Qunbang Hardware
 We Promise:
1.High quality
2. Competitive price
3. The shortest delivery
4. The fastest response
5. The best service

FAQ
1.What's your experience like?

Our general manager has been engaged in the export of fasteners since 2005. 
Our team can provide you with professional fasteners selling and smooth export services.

2.How about your price?
High quality products with reasonable price. Please give me a inquire, We will quoted you a price for you 
refer at once.

3. How do you control your quality?
We require the quality control department to inspect every production link of each shipment. And we can provide you MTC and mill certificate when the goods is finished.

4.How about your delivery time?
General speaking, if the goods is in stock, we can delivery them with 2-5days, If the quantity is 1-2container, we can give you with 18-25days,if the quantity is more than 2 container and you are very urgent, we can let factory priority produce 
your goods.

5.What is your packing?
Our packing is 20-25kg for one carton,36 or 48pcs cartons for one pallet. One pallets is about 900-960kg, We also can make customer's logo on the cartons. Or we customized cartons according to customers' 
requirement.

6.What is your payment term?
We can accept T/T,LC for general order ,Paypal and Western union for small order or samples order. 


Awaiting for your kind inquiry! Thanks & best regards!
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